Hot primary air pressure control method and device for lignite unit

Abstract

The present invention discloses a method and device for controlling the hot primary air pressure of a lignite unit. The method includes: obtaining the target load value of the lignite unit and the corresponding set value of the hot primary air pressure, as well as the actual load value of the lignite unit and the corresponding measured value of the hot primary air pressure; determining the load condition information of the lignite unit according to the target load value of the lignite unit; when the load condition information of the lignite unit is a load increasing condition, adjusting the set value of the hot primary air pressure according to the air pressure increase amount, where the air pressure increase amount is determined according to the load correction coefficient and the preset superposition amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit; inputting the measured value of the hot primary air pressure and the adjusted set value of the hot primary air pressure into a PID controller to control the hot primary air pressure of the lignite unit. The present invention can solve the problem of slow increase in the main steam pressure, improve the load change ability and AGC performance of the unit, and ensure the economic and stable operation of the unit.

Description

Technical Field

[0001] The present invention relates to the technical field of maintenance of lignite thermal power generation units, and particularly to a method and device for controlling the hot primary air pressure of lignite units. Background Art

[0002] Lignite accounts for about 13% of the total coal resources in China. At present, the total installed capacity of large-scale thermal power plants burning lignite that have been built and are under construction in the country does not exceed 15 million kilowatts, accounting for only 3%-5% of the total installed capacity of thermal power generation in the country, which is quite disproportionate to the percentage of the total lignite reserves in China. Therefore, the country is accelerating the construction of lignite-fired thermal power generation units.

[0003] Due to the disadvantages of low calorific value and high internal water content of lignite, conventional lignite-fired power generation units have disadvantages such as low efficiency and poor performance, especially the ability of the unit to coordinate load changes, which is severely affected by the AGC assessment of the power grid. Existing lignite-fired thermal power generation units have the problem of slow increase in main steam pressure, the load change ability of the unit decreases, and the AGC performance is severely affected, which affects the economic and stable operation of the unit. Summary of the Invention

[0004] An embodiment of the present invention provides a method for controlling the hot primary air pressure of a lignite unit, which is used to control the hot primary air pressure of a lignite-fired thermal power generation unit, solve the problem of slow increase in main steam pressure, improve the load change ability and AGC performance of the unit, and ensure the economic and stable operation of the unit. The method includes:

[0005] Obtain the target load value and the corresponding set value of the hot primary air pressure of the lignite unit, and the actual load value and the corresponding measured value of the hot primary air pressure of the lignite unit;

[0006] Determine the load condition information of the lignite unit according to the target load value of the lignite unit;

[0007] When the load condition information of the lignite unit is a load increasing condition, adjust the set value of the hot primary air pressure according to the air pressure increase amount, where the air pressure increase amount is determined according to a load correction coefficient and a preset superposition amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit;

[0008] Input the measured value of the hot primary air pressure and the adjusted set value of the hot primary air pressure into a PID controller to perform control on the hot primary air pressure of the lignite unit.

[0009] An embodiment of the present invention provides a device for controlling the hot primary air pressure of a lignite unit, which is used to control the hot primary air pressure of a lignite-fired thermal power generation unit, solve the problem of slow increase in main steam pressure, improve the load change ability and AGC performance of the unit, and ensure the economic and stable operation of the unit. The device includes:

[0010] A data acquisition module, configured to acquire the target load value of the lignite unit and the corresponding set value of the primary hot air pressure, the actual load value of the lignite unit and the corresponding measured value of the primary hot air pressure;

[0011] A working condition determination module, configured to determine the load working condition information of the lignite unit according to the target load value of the lignite unit;

[0012] A set value adjustment module, configured to adjust the set value of the primary hot air pressure according to the air pressure increase amount when the load working condition information of the lignite unit is a load increasing working condition, where the air pressure increase amount is determined according to a load correction coefficient and a preset superposition amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit;

[0013] A primary hot air pressure control module, configured to input the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure into a PID controller to perform control on the primary hot air pressure of the lignite unit.

[0014] An embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the method for controlling the primary hot air pressure of the lignite unit.

[0015] An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for executing the above-mentioned method for controlling the primary hot air pressure of the lignite unit.

[0016] In the embodiment of the present invention, by acquiring the target load value of the lignite unit and the corresponding set value of the primary hot air pressure, the actual load value of the lignite unit and the corresponding measured value of the primary hot air pressure; determining the load working condition information of the lignite unit according to the target load value of the lignite unit; when the load working condition information of the lignite unit is a load increasing working condition, adjusting the set value of the primary hot air pressure according to the air pressure increase amount, where the air pressure increase amount is determined according to a load correction coefficient and a preset superposition amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit; inputting the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure into a PID controller to perform control on the primary hot air pressure of the lignite unit. In the load increasing working condition of the embodiment of the present invention, the set value of the primary hot air pressure is adjusted according to the air pressure increase amount, and the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure are input into a PID controller to perform control on the primary hot air pressure of the lignite unit, so as to realize the accelerated increase of the primary hot air pressure, enhance the combustion of the lignite boiler, so as to realize the variable load capacity of the unit, solve the problem of slow increase of the main steam pressure, improve the variable load capacity and AGC performance of the unit, and ensure the economic and stable operation of the unit. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0018] Figure 1 Schematic diagram of the hot primary air pressure control method for a lignite unit in an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the method for determining the load condition information of a lignite unit in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the method for determining the load correction coefficient in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the method for determining the air pressure increase amount in an embodiment of the present invention;

[0022] Figure 5 Structural diagram of the hot primary air pressure control device for a lignite unit in an embodiment of the present invention;

[0023] Figure 6 Schematic diagram of the structure of a computer device in an embodiment of the present invention. Specific embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer and more understandable, the following will further elaborate on the embodiments of the present invention in conjunction with the drawings. Herein, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

[0025] As previously mentioned, through the analysis of the unit coordinated load change test, it is found that in the initial stage of load increase, in response to the load demand, the valve opening of the steam turbine increases, while the boiler combustion is poor and the heat storage is insufficient, resulting in a slow increase in the main steam pressure, a decline in the unit's load change ability, and an impact on the AGC performance. Currently, to solve the problem of slow boiler pressure increase in the initial stage of load increase, the total boiler air volume is increased, the air-coal ratio is improved, and the boiler combustion is strengthened. In the initial stage of load increase, only by increasing the air-coal ratio in the furnace cannot ensure that enough pulverized coal in the coal mill enters the furnace for combustion, and cannot fully increase the boiler pressure; increasing the air-coal ratio causes a high oxygen content in the furnace, an increase in pollutants such as nitrogen oxides generated by combustion, and affects the economic operation of the unit.

[0026] In order to control the primary hot air pressure of a lignite-fired power generation unit, solve the problem of slow increase in main steam pressure, improve the load-changing ability and AGC performance of the unit, and ensure the economic and stable operation of the unit, an embodiment of the present invention provides a method for controlling the primary hot air pressure of a lignite unit, as Figure 1 shown, the method may include:

[0027] Step 101, obtain the target load value of the lignite unit and the corresponding primary hot air pressure set value, the actual load value of the lignite unit and the corresponding primary hot air pressure measured value;

[0028] Step 102, determine the load condition information of the lignite unit according to the target load value of the lignite unit;

[0029] Step 103, when the load condition information of the lignite unit is a load-increasing condition, adjust the primary hot air pressure set value according to the air pressure increase amount, the air pressure increase amount is determined according to a load correction coefficient and a preset superimposed amount, and the load correction coefficient is determined according to the target load value of the lignite unit and the actual load value of the lignite unit;

[0030] Step 104, input the primary hot air pressure measured value and the adjusted primary hot air pressure set value into a PID controller to control the primary hot air pressure of the lignite unit.

[0031] It can be known from Figure 1 shown that in the embodiment of the present invention, by obtaining the target load value of the lignite unit and the corresponding primary hot air pressure set value, the actual load value of the lignite unit and the corresponding primary hot air pressure measured value; determining the load condition information of the lignite unit according to the target load value of the lignite unit; when the load condition information of the lignite unit is a load-increasing condition, adjusting the primary hot air pressure set value according to the air pressure increase amount, the air pressure increase amount is determined according to a load correction coefficient and a preset superimposed amount, and the load correction coefficient is determined according to the target load value of the lignite unit and the actual load value of the lignite unit; inputting the primary hot air pressure measured value and the adjusted primary hot air pressure set value into a PID controller to control the primary hot air pressure of the lignite unit. In the embodiment of the present invention, when in a load-increasing condition, the primary hot air pressure set value is adjusted according to the air pressure increase amount, the primary hot air pressure measured value and the adjusted primary hot air pressure set value are input into a PID controller to control the primary hot air pressure of the lignite unit, so as to realize the accelerated increase of the primary hot air pressure, enhance the combustion of the lignite boiler, so as to realize the load-changing ability of the unit, solve the problem of slow increase in main steam pressure, improve the load-changing ability and AGC performance of the unit, and ensure the economic and stable operation of the unit.

[0032] In the embodiment, obtain the target load value of the lignite unit and the corresponding primary hot air pressure set value, the actual load value of the lignite unit and the corresponding primary hot air pressure measured value; determine the load condition information of the lignite unit according to the target load value of the lignite unit.

[0033] In this embodiment, as Figure 2 shown, the lignite unit load condition information is determined as follows:

[0034] Step 201: The target load value of the lignite unit is calculated through differential calculation in the DCS system to obtain a calculation result;

[0035] Step 202: Compare the calculation result with 0. If the calculation result is greater than or equal to 0, it is determined that the lignite unit load condition information is a load increasing condition. If the calculation result is less than 0, it is determined that the lignite unit load condition information is a load decreasing condition.

[0036] During specific implementation, at the initial stage of load increase, to ensure sufficient pulverized coal combustion in the furnace and rapid heat release, and to increase the main steam pressure as quickly as possible, corrections under dynamic conditions need to be added to the original ratio curve to accelerate the increase of the primary hot air pressure. When the unit is at the end stage of load increase, the dynamic correction amount of the primary hot air pressure is reduced to 0, and the coal quantity - primary hot air pressure ratio curve control under static conditions is maintained.

[0037] In the embodiment, when the lignite unit load condition information is a load increasing condition, the set value of the primary hot air pressure is adjusted according to the air pressure increase amount. The air pressure increase amount is determined according to the load correction coefficient and the preset superimposed amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit.

[0038] In this embodiment, as Figure 3 shown, the load correction coefficient is determined as follows:

[0039] Step 301: Calculate the difference between the target load value and the actual load value of the lignite unit;

[0040] Step 302: If the difference is greater than or equal to the first threshold, the load correction coefficient is the first set value;

[0041] Step 303: If the difference is less than the first threshold, the load correction coefficient is the second set value.

[0042] In this embodiment, as Figure 4 shown, the air pressure increase amount is determined as follows:

[0043] Step 401: Determine the preset superimposed amount according to the test results of the main steam pressure characteristics of the unit and the information on the change of the main steam pressure based on the primary hot air pressure under stable load conditions;

[0044] Step 402: Multiply the load correction coefficient by the preset superimposed amount to determine the air pressure increase amount.

[0045] In this embodiment, adjusting the set value of the primary hot air pressure according to the air pressure increase amount includes:

[0046] Weighting the air pressure increase amount and the set value of the primary hot air pressure according to a preset weighting coefficient;

[0047] Adjusting the set value of the primary hot air pressure according to the weighted result.

[0048] During specific implementation, when the unit is in the load increasing condition, on the basis of the set value curve of the primary hot air pressure corresponding to the load, a constant value (air pressure increase amount) is superimposed to increase the set value of the primary hot air pressure under the load increasing condition, enhance the combustion of the lignite boiler, and realize the variable load capacity of the unit. The determination basis of the air pressure increase amount of the increased primary hot air pressure is: under the condition of stable unit load, conduct a characteristic test of the primary hot air pressure on the main steam pressure of the unit. At the same time, refer to the change of the required main steam pressure when the unit increases the load, and finally determine the increased value of the primary hot air pressure under the load increase.

[0049] During specific implementation, the correction design idea for the target load and the actual load is: calculate the difference between the target load value of the lignite unit and the actual load value of the lignite unit, and use the size of the difference as the judgment condition for the correction coefficient. For example: when the difference is greater than or equal to the first threshold, the correction coefficient is 1; when the difference is lower than this fixed value, the correction coefficient is switched to 0, and a rate limit is designed for the switching process to achieve smooth switching. The correction design idea for the full load section is: according to the different primary hot air pressure correction coefficients corresponding to the unit load, multiply the coefficient by the increment as the final increased amount of the primary hot air pressure under the load increase; the method for obtaining the correction coefficient is that when the unit operates in a certain stable load condition and the main parameters of the unit are stable, when the unit increases the load, keep the original air pressure increase amount of the primary hot air pressure, monitor the change of the main parameters of the unit, and appropriately increase or decrease the air pressure increase amount of the primary hot air pressure according to the results of the change of each parameter, so as to determine the correction coefficient under this condition. The initially set preset weighting coefficient for the two signals in the weighted calculation is "1", and it can be modified again according to factors such as the coal quality of the boiler.

[0050] In the embodiment, input the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure into the PID controller to control the primary hot air pressure of the lignite unit.

[0051] During specific implementation, the hot primary air pressure of a lignite-fired thermal power generation unit adopts PID control. The set value of the hot primary air pressure is set according to the coal quantity of the unit. On this control basis, the set value is increased using the above steps. The PID control strategy for the hot primary air pressure is as follows: the controlled variable is the hot primary air pressure in the furnace; the set value is the function curve of the hot primary air pressure corresponding to the coal quantity, with a lower limit; the control loop is a single-loop PID control, and the control proportional (P) and integral (I) parameters are designed with variable parameters according to the unit load function; the load function curves of the proportional and integral are both obtained through disturbance tests: when the unit is in various stable load conditions, the disturbance test is carried out on the hot primary air pressure control system to obtain the optimal parameters under each condition; taking this as the basis of the parameter function, during the process of the unit's load increase and decrease, the parameter curve is verified and optimized to avoid the control fluctuation of the hot primary air pressure caused by parameter changes. Under the load increase condition, the hot primary air pressure increase strategy is as follows: the value obtained by differentiating the unit target load is used to judge whether the unit is in the load increase condition. If the current condition is a load increase, the boosting weighted calculation is carried out on the set value curve of the hot primary air pressure to increase the hot primary air pressure under load increase. To ensure that the hot primary air pressure increases at the initial stage of load increase, improve the variable load capacity, and at the same time, in the later stage of load increase, it does not cause the hot primary air pressure to be too high, resulting in excessive overshoot of parameters such as the unit load and pressure, affecting the unit performance. In the boosting strategy, the correction of the deviation between the target load and the actual load on the boosting amount is increased. At the same time, to meet the adaptability of the hot primary air pressure boosting adjustment under the load increase condition in the full load section of the unit, the coefficient correction of the full load section is designed.

[0052] In the embodiment of the present invention, at the initial stage of the unit's load increase, the hot primary air pressure of the boiler is increased rapidly, the load-carrying capacity of the hot primary air entering the coal mill is enhanced, sufficient pulverized coal is ensured to be blown into the furnace, and the main steam pressure is increased rapidly; at the initial stage of the unit's load increase, the hot primary air pressure of the boiler is increased rapidly, the drying output of the coal mill is enhanced, the combustion efficiency of the furnace is improved, and the main steam pressure is increased rapidly; without affecting the air-coal ratio of the boiler combustion, the boiler oxygen content is reasonably controlled, which is beneficial to the control of pollutants.

[0053] Based on the same inventive concept, the embodiment of the present invention also provides a control device for the hot primary air pressure of a lignite unit, as described in the following embodiments. Since the principles of solving these problems are similar to those of the control method for the hot primary air pressure of a lignite unit, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0054] Figure 5 is the structural diagram of the control device for the hot primary air pressure of a lignite unit in the embodiment of the present invention, as Figure 5 shown, the device includes:

[0055] A data acquisition module 501, configured to acquire the target load value of the lignite unit and the corresponding set value of the hot primary air pressure, the actual load value of the lignite unit and the corresponding measured value of the hot primary air pressure;

[0056] The operating condition determination module 502 is configured to determine the load operating condition information of the lignite unit according to the target load value of the lignite unit;

[0057] The set value adjustment module 503 is configured to adjust the set value of the primary hot air pressure according to the air pressure increase amount when the load operating condition information of the lignite unit is the load increasing operating condition. The air pressure increase amount is determined according to the load correction coefficient and the preset superposition amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit;

[0058] The air pressure control module 504 is configured to input the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure into a PID controller to control the primary hot air pressure of the lignite unit.

[0059] In one embodiment, the load correction coefficient is determined in the following manner:

[0060] Calculate the difference between the target load value and the actual load value of the lignite unit;

[0061] If the difference is greater than or equal to the first threshold, the load correction coefficient is the first set value;

[0062] If the difference is less than the first threshold, the load correction coefficient is the second set value.

[0063] In one embodiment, the air pressure increase amount is determined in the following manner:

[0064] Determine the preset superposition amount according to the test results of the main steam pressure characteristics of the unit and the information on the change of the main steam pressure under the stable load operating condition of the primary hot air pressure;

[0065] Multiply the load correction coefficient by the preset superposition amount to determine the air pressure increase amount.

[0066] In one embodiment, the set value adjustment module 503 is further configured to:

[0067] Weight the air pressure increase amount and the set value of the primary hot air pressure according to a preset weighting coefficient;

[0068] Adjust the set value of the primary hot air pressure according to the weighted result.

[0069] In summary, in the embodiments of the present invention, the target load value of the lignite unit and the corresponding set value of the primary hot air pressure are obtained, and the actual load value of the lignite unit and the corresponding measured value of the primary hot air pressure are obtained; according to the target load value of the lignite unit, the load condition information of the lignite unit is determined; when the load condition information of the lignite unit is a load increasing condition, the set value of the primary hot air pressure is adjusted according to the air pressure increase amount, the air pressure increase amount is determined according to the load correction coefficient and the preset superposition amount, and the load correction coefficient is determined according to the target load value of the lignite unit and the actual load value of the lignite unit; the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure are input into a PID controller to control the primary hot air pressure of the lignite unit. In the load increasing condition, in the embodiments of the present invention, the set value of the primary hot air pressure is adjusted according to the air pressure increase amount, and the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure are input into the PID controller to control the primary hot air pressure of the lignite unit, so as to realize the accelerated increase of the primary hot air pressure, enhance the combustion of the lignite boiler, realize the variable load capacity of the unit, solve the problem of slow increase of the main steam pressure, improve the variable load capacity of the unit and the AGC performance, and ensure the economic and stable operation of the unit.

[0070] Based on the foregoing inventive concept, as Figure 6 shown, the present invention further provides a computer device 600, including a memory 610, a processor 620, and a computer program 630 stored in the memory 610 and executable on the processor 620. When the processor 620 executes the computer program 630, the foregoing method for determining the cuttings return amount in oil and gas drilling is implemented.

[0071] Based on the foregoing inventive concept, the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the foregoing method for determining the cuttings return amount in oil and gas drilling is implemented.

[0072] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0073] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices produce a means for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0074] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction means that implements the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0075] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one flow Figure 1 one flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0076] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A control method for the hot primary air pressure of a lignite unit, characterized in that, Including: Obtaining the target load value of the lignite unit and the corresponding set value of the primary hot air pressure, the actual load value of the lignite unit and the corresponding measured value of the primary hot air pressure; Determining the load condition information of the lignite unit according to the target load value of the lignite unit; When the load condition information of the lignite unit is the load increasing condition, adjusting the set value of the primary hot air pressure according to the air pressure increase amount, where the air pressure increase amount is determined according to the load correction coefficient and the preset superposition amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit; Inputting the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure into a PID controller to control the primary hot air pressure of the lignite unit; Determining the air pressure increase amount in the following manner: determining the preset superposition amount according to the test results of the primary hot air pressure on the main steam pressure characteristics of the unit under the stable load condition and the information on the change of the main steam pressure; multiplying the load correction coefficient by the preset superposition amount to determine the air pressure increase amount.

2. The hot primary air pressure control method for a lignite unit according to claim 1, characterized in that, Determining the load correction coefficient in the following manner: Calculating the difference between the target load value and the actual load value of the lignite unit; If the difference is greater than or equal to the first threshold, the load correction coefficient is the first set value; If the difference is less than the first threshold, the load correction coefficient is the second set value.

3. The hot primary air pressure control method for a lignite unit according to claim 1, characterized in that, Adjusting the set value of the primary hot air pressure according to the air pressure increase amount includes: Weighting the air pressure increase amount and the set value of the primary hot air pressure according to the preset weighting coefficient; Adjusting the set value of the primary hot air pressure according to the weighted result.

4. A hot primary air pressure control device for a lignite unit, characterized in that, Including: A data acquisition module for obtaining the target load value of the lignite unit and the corresponding set value of the primary hot air pressure, the actual load value of the lignite unit and the corresponding measured value of the primary hot air pressure; A condition determination module for determining the load condition information of the lignite unit according to the target load value of the lignite unit; A set value adjustment module for, when the load condition information of the lignite unit is the load increasing condition, adjusting the set value of the primary hot air pressure according to the air pressure increase amount, where the air pressure increase amount is determined according to the load correction coefficient and the preset superposition amount, and the load correction coefficient is determined according to the target load value and the actual load value of the lignite unit; An air pressure control module for inputting the measured value of the primary hot air pressure and the adjusted set value of the primary hot air pressure into a PID controller to control the primary hot air pressure of the lignite unit; Determining the air pressure increase amount in the following manner: determining the preset superposition amount according to the test results of the primary hot air pressure on the main steam pressure characteristics of the unit under the stable load condition and the information on the change of the main steam pressure; multiplying the load correction coefficient by the preset superposition amount to determine the air pressure increase amount.

5. The hot primary air pressure control device for the lignite unit according to claim 4, characterized in that, Determining the load correction coefficient in the following manner: Calculating the difference between the target load value and the actual load value of the lignite unit; If the difference is greater than or equal to the first threshold, the load correction coefficient is the first set value; If the difference is less than the first threshold, the load correction coefficient is the second set value.

6. The hot primary air pressure control device for a lignite unit according to claim 4, wherein The set value adjustment module is further configured to: Weight the air pressure increase amount and the set value of the primary hot air pressure according to the preset weighting coefficient; Adjust the set value of the primary hot air pressure according to the weighted result.

7. A computer device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, the method according to any one of claims 1 to 3 is implemented.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program for executing the method according to any one of claims 1 to 3.

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