Coal quality correction method and device for boiler unit

Abstract

The invention discloses a coal quality correction method and device for a boiler unit. The method comprises the following steps: acquiring state information of a unit; determining the working condition of the unit according to the state information; when the unit is in the steady-state working condition, the current coal quality coefficient is calculated according to the fuel quantity of the unit; judging whether to update the coal quality correction coefficient or not according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient; and when the coal quality correction coefficient is updated, performing coal quality correction on the unit according to the updated coal quality correction coefficient. According to the technical scheme provided by the embodiment of the invention, the working condition of the boiler unit is judged by acquiring the state information of the boiler unit, and the actual fuel in the boiler is adjusted by updating the coal quality correction coefficient when the boiler unit is in the stable working condition, so that coal quality correction is completed, and the boiler unit reaches the expected working condition; and the operation efficiency and the stability of the boiler unit of the thermal power plant are improved.

Description

Technical Field

[0001] The invention relates to the technical field of automatic control of thermal power plants, and in particular to a method and device for correcting coal quality of a boiler unit. Background Art

[0002] With the development of the coal-fired power market and the marketization of fuel prices, the fuel sources of thermal power plants have also become diversified. In the process of blending multiple fuels, the changes in the blending ratio of coal types and the non-uniformity of blending will cause random changes in the calorific value of the fuel entering the boiler chamber, affecting the stable operation of the boiler unit. Therefore, it is urgent to improve and optimize the coal quality correction method of the boiler unit to improve the adaptability and response speed of the boiler unit to changes in coal quality and improve the stability of the boiler unit operation. Summary of the invention

[0003] The present invention provides a method and device for correcting coal quality of a boiler unit, so as to quickly adapt to the change of coal quality and improve the stability of operation of the boiler unit.

[0004] According to one aspect of the present invention, a method for calibrating coal quality of a boiler unit is provided, comprising:

[0005] Get the status information of the unit;

[0006] determining the working condition of the unit according to the status information;

[0007] When the unit is in a steady-state condition, calculating the current coal quality coefficient according to the fuel quantity of the unit;

[0008] Determining whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient;

[0009] When the coal quality correction coefficient is updated, the coal quality correction of the unit is performed according to the updated coal quality correction coefficient.

[0010] Optionally, when the unit is in a steady-state condition, the current coal quality coefficient is calculated according to the fuel quantity of the unit, including:

[0011] The current coal quality coefficient is calculated based on the relationship between the designed fuel quantity and the actual fuel quantity of the unit.

[0012] Optionally, judging whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient includes:

[0013] When the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference, the coal quality correction coefficient is updated.

[0014] Optionally, when the coal quality correction coefficient is updated, the coal quality correction of the unit is performed according to the updated coal quality correction coefficient, including: controlling the total fuel amount, total air volume, total water supply flow and primary air pressure of the unit to remain unchanged, and adjusting the actual fuel amount of the unit.

[0015] Optionally, before updating the coal quality correction coefficient when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference, it also includes: judging whether the unit is out of coal.

[0016] Optionally, determining the working status of the unit according to the status information includes:

[0017] When the status information meets the preset status conditions, it is judged that the unit is in a steady-state operating condition; wherein, the status information includes a unit load command, a unit pressure command, a main steam pressure, a unit load, a water supply master control state and a fuel master control state, and the preset status conditions include that the unit load command and the unit pressure command have not changed within a preset time, the deviation of the main steam pressure is less than a preset threshold of the main steam pressure deviation within a preset time, the deviation of the unit load is less than a preset threshold of the unit load deviation within a preset time, the water supply master control is in an automatic state, and the fuel master control is in an automatic state.

[0018] Optionally, determining the working status of the unit according to the status information further includes:

[0019] When the unit load is less than a preset unit load threshold, the coal quality correction state of the unit is switched to a manual state.

[0020] Optionally, determining the working condition of the unit according to the status information further includes: when the unit is in a non-steady-state condition, maintaining the current value of the coal quality correction coefficient as the coal quality correction coefficient at the time of the last coal quality correction.

[0021] Optionally, determining the working status of the unit according to the status information further includes:

[0022] When the unit is in an accident condition, the current value of the coal quality correction coefficient is adjusted to 1.

[0023] According to another aspect of the present invention, a coal quality correction device for a boiler unit is provided, comprising:

[0024] The working condition judgment module is used to determine the working condition of the unit according to the status information;

[0025] A coal quality coefficient calculation module, used to calculate the current coal quality coefficient according to the fuel amount of the unit when the unit is in a steady-state condition;

[0026] A correction judgment module, used for judging whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient;

[0027] The correction module is used to perform coal quality correction on the unit according to the updated coal quality correction coefficient when the coal quality correction coefficient is updated.

[0028] The technical solution provided by the embodiment of the present invention determines the working condition of the boiler unit by obtaining status information by collecting various operating parameters of the boiler unit. When the deviation between the current coal quality coefficient of the boiler unit and the coal quality correction coefficient is too large under the stable operating condition of the boiler unit, the actual fuel in the boiler is adjusted by updating the coal quality correction coefficient to complete the coal quality correction so that the boiler unit reaches the desired working condition, thereby improving the operating efficiency and stability of the boiler unit in the thermal power plant.

[0029] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A flow chart of a method for calibrating coal quality of a boiler unit provided by an embodiment of the present invention;

[0032] Figure 2 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0033] Figure 3 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0034] Figure 4 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0035] Figure 5 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0036] Figure 6 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0037] Figure 7 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0038] Figure 8 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0039] Fig. 9 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention;

[0040] Fig.10 A schematic structural diagram of a coal quality correction device for a boiler unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Figure 1 The present invention provides a flowchart of a method for calibrating the coal quality of a boiler unit. This embodiment is applicable to the case of calibrating the coal quality of a boiler in a thermal power plant. The method can be executed by a coal quality calibration device of the boiler unit. The coal quality calibration device of the boiler unit can be implemented in the form of hardware and / or software. The coal quality calibration device of the boiler unit can be configured in the DCS system (Distributed Control System) of the thermal power plant. Figure 1 As shown, the method includes:

[0044] S110, obtaining status information of the unit;

[0045] Specifically, the distributed control system of a thermal power plant is a computer integrated system that integrates process control and process monitoring. The distributed control system of a thermal power plant can collect various parameters such as temperature, pressure, load, flow rate and fuel quantity of the boiler unit in real time through various sensors or actuators installed in the boiler unit, so as to analyze and calculate the status information of the boiler unit.

[0046] S120, determining the working status of the unit according to the status information;

[0047] Specifically, the distributed control system determines the working condition of the current boiler unit according to the acquired state information, so as to match the correction method applicable to the working condition to perform coal quality correction. Exemplarily, the working condition of the boiler unit may include a steady-state condition, an unsteady-state condition, and an accident condition. Among them, a steady-state condition may be a working condition in which all state information of the boiler unit meets the preset state conditions; an unsteady-state condition may be a working condition in which a certain state information of the boiler unit does not meet the preset state conditions; an accident condition may be a working condition in which a certain equipment in the boiler unit fails and affects the normal operation of the unit, such as the tripping of the standby fan of the boiler unit.

[0048] S130, when the unit is in a steady-state condition, calculating the current coal quality coefficient according to the fuel quantity of the unit;

[0049] Specifically, under steady-state conditions, the operation of various equipment in the boiler unit is relatively stable, and the fluctuation of fuel calorific value is small. The distributed control system can calculate the coal quality coefficient of the boiler unit under the current steady-state condition based on the fuel quantity of the boiler unit. Among them, the coal quality coefficient can represent the comprehensive quality of the mixed fuel of various fuels being burned in the boiler. The continuous addition of fuel to the boiler will cause the coal quality coefficient to change continuously.

[0050] S140, judging whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient;

[0051] Specifically, the current value of the coal quality correction coefficient may represent the comprehensive quality that the fuel in the boiler unit should achieve under the current steady-state condition. When the deviation between the current coal quality coefficient and the current value of the coal quality correction coefficient is too large, it means that the fuel combustion condition of the current boiler unit has not reached the expected state, and the coal quality correction coefficient needs to be updated to correct the coal quality of the fuel of the boiler unit so that the boiler unit can reach the expected working condition.

[0052] S150: When the coal quality correction coefficient is updated, the coal quality correction of the unit is performed according to the updated coal quality correction coefficient.

[0053] Specifically, when the coal quality correction coefficient is updated, the distributed control system adjusts the actual fuel amount in the boiler unit according to the updated coal quality correction coefficient so that the actual working condition in the boiler unit can reach the expected working condition. When the coal quality correction judgment is performed at the next moment, the coal quality coefficient calculated at the next moment is compared with the updated coal quality correction coefficient to determine whether the boiler unit needs to perform coal quality correction at the next moment, thereby improving the efficiency of the boiler unit and maintaining the stability of the operation of the boiler unit.

[0054] The technical solution provided by the embodiment of the present invention determines the working condition of the boiler unit by obtaining status information by collecting various operating parameters of the boiler unit. When the deviation between the current coal quality coefficient of the boiler unit and the coal quality correction coefficient is too large under the stable operating condition of the boiler unit, the actual fuel in the boiler is adjusted by updating the coal quality correction coefficient to complete the coal quality correction so that the boiler unit reaches the desired working condition, thereby improving the operating efficiency and stability of the boiler unit in the thermal power plant.

[0055] Optionally, Figure 2 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Figure 2 When the unit is in steady state, the current coal quality coefficient is calculated based on the fuel quantity of the unit, including:

[0056] S210, obtaining status information of the unit;

[0057] S220, determining the working status of the unit according to the status information;

[0058] S230, calculating the current coal quality coefficient according to the relationship between the designed fuel quantity and the actual fuel quantity of the unit;

[0059] Specifically, the actual fuel quantity is the amount of fuel actually involved in the combustion operation in the boiler unit under the steady-state condition. The design fuel quantity of the unit can be the amount of fuel required by the unit to meet the rated condition calculated by the distributed control system through the acquired state information when the unit is in the steady-state condition. The distributed control system calculates the current coal quality coefficient based on a comprehensive analysis of the relationship between the design fuel quantity and the actual fuel quantity of the unit to reflect the quality of the fuel actually burned in the current boiler.

[0060] S240, judging whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient;

[0061] S250. Determine whether to update the coal quality correction coefficient based on the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient.

[0062] Optionally, Figure 3A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Figure 3 . Determine whether to update the coal quality correction coefficient based on the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient, including:

[0063] S310, obtaining status information of the unit;

[0064] S320, determining the working status of the unit according to the status information;

[0065] S330, calculating the current coal quality coefficient according to the relationship between the designed fuel quantity and the actual fuel quantity of the unit;

[0066] S340, updating the coal quality correction coefficient when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference;

[0067] Specifically, when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is not greater than the preset difference, it means that the fuel combustion condition of the current boiler unit has reached the expected state, and there is no need to perform coal quality correction on the fuel in the boiler unit. When the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than the preset difference, it means that the fuel combustion condition of the current boiler unit has not reached the expected state, and the coal quality correction coefficient needs to be updated to perform coal quality correction on the fuel of the boiler unit so that the boiler unit reaches the expected working condition.

[0068] S350: When the coal quality correction coefficient is updated, the coal quality correction of the unit is performed according to the updated coal quality correction coefficient.

[0069] Optionally, Figure 4 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Figure 4 When the coal quality correction coefficient is updated, the unit is subjected to coal quality correction according to the updated coal quality correction coefficient, including:

[0070] S410, obtaining status information of the unit;

[0071] S420, determining the working status of the unit according to the status information;

[0072] S430, calculating the current coal quality coefficient according to the relationship between the designed fuel quantity and the actual fuel quantity of the unit;

[0073] S440, updating the coal quality correction coefficient when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference;

[0074] S450, control the total fuel quantity, total air volume, total feed water flow and primary air pressure of the unit to remain unchanged, and adjust the actual fuel quantity of the unit.

[0075] Specifically, the total fuel quantity may be the total fuel quantity in the boiler unit during operation of the boiler unit, the total air volume may be the total amount of air supplied to the boiler unit for combustion during operation of the boiler unit, the total feed water flow rate may be the total amount of water injected into the boiler chamber for heating, and the primary air pressure may be the air supply pressure used to blow the fuel into the boiler for combustion. By controlling the total fuel quantity, total air volume, total feed water flow rate and primary air pressure of the unit to remain unchanged, the operating condition of the boiler unit remains basically unchanged before and after the coal quality correction, and only the actual fuel quantity in the boiler unit is adjusted to make the actual operating condition of the boiler unit after the coal quality correction reach the expected working condition under the steady-state condition.

[0076] Optionally, Figure 5 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Figure 5 Before updating the coal quality correction coefficient when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than the preset difference, the method further includes:

[0077] S510, obtaining status information of the unit;

[0078] S520, determining the working status of the unit according to the status information;

[0079] S530, calculating the current coal quality coefficient according to the relationship between the designed fuel quantity and the actual fuel quantity of the unit;

[0080] S540, determine whether the unit is out of coal.

[0081] Specifically, coal shortage may refer to the condition in which the fuel supply to the boiler unit stops during operation. Before determining whether the coal quality correction coefficient needs to be updated, it can be further determined whether the boiler unit has experienced coal shortage, thereby ensuring that the operating conditions of the boiler unit have not undergone significant changes, so as to avoid the failure of the coal quality correction result caused by a sudden change in the operating conditions. When it is determined that the boiler unit has not experienced coal shortage, the coal quality correction coefficient can be further updated to perform coal quality correction.

[0082] S550, updating the coal quality correction coefficient when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference;

[0083] S560, control the total fuel quantity, total air volume, total feed water flow and primary air pressure of the unit to remain unchanged, and adjust the actual fuel quantity of the unit.

[0084] Optionally, Figure 6 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Figure 6 . Determine the unit's operating status based on status information, including:

[0085] S610, obtaining status information of the unit;

[0086] S620, when the status information meets the preset status conditions, it is determined that the unit is in a steady-state condition; wherein the status information includes the unit load command, the unit pressure command, the main steam pressure, the unit load, the water supply master control state and the fuel master control state, and the preset status conditions include that the unit load command and the unit pressure command have not changed within the preset time, the main steam pressure deviation is less than the main steam pressure deviation preset threshold value within the preset time, the unit load deviation is less than the unit load deviation preset threshold value within the preset time, the water supply master control is in the automatic state and the fuel master control is in the automatic state;

[0087] Specifically, the status information of the boiler unit may be the unit load instruction, the unit pressure instruction, the main steam pressure, the unit load, the water supply master control state and the fuel master control state. When all of the above status information of the boiler unit satisfies the preset state conditions, it can be considered that the boiler unit is currently in a steady-state condition. Exemplarily, the preset state conditions may be that the unit load instruction has not changed for 30 seconds, the unit pressure quality has not changed for 30 seconds, the unit load deviation is less than 3.5MW for 30 seconds, the main steam pressure deviation is less than 0.3MPa for 30 seconds, and the water supply master control is in an automatic state and the fuel master control is in an automatic state.

[0088] S630, calculating the current coal quality coefficient according to the relationship between the designed fuel quantity and the actual fuel quantity of the unit;

[0089] S640, updating the coal quality correction coefficient when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference;

[0090] S650, control the total fuel quantity, total air volume, total feed water flow and primary air pressure of the unit to remain unchanged, and adjust the actual fuel quantity of the unit.

[0091] Optionally, Figure 7 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Figure 7 . Determine the working status of the unit based on the status information, including:

[0092] S710, obtaining status information of the unit;

[0093] S720: When the unit load is less than the preset unit load threshold, the coal quality correction state of the unit is switched to manual state.

[0094] Specifically, when the unit load of the boiler unit is less than the preset unit load threshold, the boiler cannot maintain the DC state, and the boiler changes from the DC furnace state to the bubble furnace state. At this time, the coal quality correction of the boiler unit can be switched to the manual state, and the actual working condition in the boiler unit can reach the expected working condition by manually adjusting the fuel amount, thereby improving the efficiency and stability of the boiler unit.

[0095] Optionally, Figure 8 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Figure 8 . Determine the working status of the unit based on the status information, including:

[0096] S810, obtaining status information of the unit;

[0097] S820. When the unit is in a non-steady-state condition, the current value of the coal quality correction coefficient is maintained as the coal quality correction coefficient at the time of the last coal quality correction.

[0098] Specifically, the unit being in a non-steady-state condition may be a working condition in which any state information of the boiler unit does not meet a preset condition. When the boiler unit is in a non-steady-state condition, the coal quality coefficient calculation is stopped, and the current value of the coal quality correction coefficient is kept as the coal quality correction coefficient at the last coal quality correction under a steady-state condition, so that when the boiler unit is in a steady-state condition next time, the coal quality correction can be re-performed according to the last coal quality correction coefficient.

[0099] Optionally, Fig. 9 A flow chart of another method for calibrating coal quality of a boiler unit provided in an embodiment of the present invention. Fig. 9 . Determine the working status of the unit based on the status information, including:

[0100] S910, obtaining status information of the unit;

[0101] S920. When the unit is in an accident condition, adjust the current value of the coal quality correction coefficient to 1.

[0102] Specifically, when the boiler unit is in an accident condition and needs to be shut down and restarted, the current value of the coal quality correction coefficient can be adjusted to 1 for initialization, so as to facilitate the first coal quality correction after the boiler unit is started.

[0103] Fig.10 The present invention provides a schematic diagram of the structure of a coal quality correction device for a boiler unit. Fig.10 As shown, the device comprises:

[0104] The working condition judgment module 101 is used to determine the working condition of the unit according to the status information;

[0105] A coal quality coefficient calculation module 102, used to calculate the current coal quality coefficient according to the fuel amount of the unit when the unit is in a steady state;

[0106] A correction judgment module 103, used to judge whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient;

[0107] The correction module 104 is used to perform coal quality correction on the unit according to the updated coal quality correction coefficient when the coal quality correction coefficient is updated.

[0108] The coal quality correction device for a boiler unit provided in an embodiment of the present invention can execute the coal quality correction method for a boiler unit provided in any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0109] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0110] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calibrating coal quality of a boiler unit, characterized in that: include: Get the status information of the unit; determining the working condition of the unit according to the status information; When the unit is in a steady-state condition, calculating the current coal quality coefficient according to the fuel quantity of the unit; Determining whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient; When the coal quality correction coefficient is updated, the coal quality correction of the unit is performed according to the updated coal quality correction coefficient.

2. The coal quality correction method for a boiler unit according to claim 1, characterized in that: When the unit is in a steady-state condition, the current coal quality coefficient is calculated according to the fuel quantity of the unit, including: The current coal quality coefficient is calculated based on the relationship between the designed fuel quantity and the actual fuel quantity of the unit.

3. The coal quality correction method for a boiler unit according to claim 1, characterized in that: Judging whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient includes: When the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference, the coal quality correction coefficient is updated.

4. The coal quality correction method for a boiler unit according to claim 1, characterized in that: When the coal quality correction coefficient is updated, the coal quality correction of the unit is performed according to the updated coal quality correction coefficient, including: controlling the total fuel amount, total air volume, total water supply flow and primary air pressure of the unit to remain unchanged, and adjusting the actual fuel amount of the unit.

5. The coal quality correction method for a boiler unit according to claim 3, characterized in that: Before updating the coal quality correction coefficient when the difference between the current coal quality coefficient and the current value of the coal quality correction coefficient is greater than a preset difference, it also includes: judging whether the unit is out of coal.

6. The coal quality correction method for a boiler unit according to claim 1, characterized in that: Determining the working status of the unit according to the status information includes: When the status information meets the preset status conditions, it is judged that the unit is in a steady-state operating condition; wherein, the status information includes a unit load command, a unit pressure command, a main steam pressure, a unit load, a water supply master control state and a fuel master control state, and the preset status conditions include that the unit load command and the unit pressure command have not changed within a preset time, the deviation of the main steam pressure is less than a preset threshold of the main steam pressure deviation within a preset time, the deviation of the unit load is less than a preset threshold of the unit load deviation within a preset time, the water supply master control is in an automatic state, and the fuel master control is in an automatic state.

7. The coal quality correction method for a boiler unit according to claim 6, characterized in that: Determining the working status of the unit according to the status information also includes: When the unit load is less than a preset unit load threshold, the coal quality correction state of the unit is switched to a manual state.

8. The coal quality correction method for a boiler unit according to claim 1, characterized in that: Determining the working condition of the unit according to the status information also includes: when the unit is in a non-steady-state condition, maintaining the current value of the coal quality correction coefficient as the coal quality correction coefficient at the time of the last coal quality correction.

9. The coal quality correction method for a boiler unit according to claim 1, characterized in that: Determining the working status of the unit according to the status information also includes: When the unit is in an accident condition, the current value of the coal quality correction coefficient is adjusted to 1.

10. A coal quality correction device for a boiler unit, characterized in that: include: The working condition judgment module is used to determine the working condition of the unit according to the status information; A coal quality coefficient calculation module, used to calculate the current coal quality coefficient according to the fuel amount of the unit when the unit is in a steady-state condition; A correction judgment module, used for judging whether to update the coal quality correction coefficient according to the relationship between the current coal quality coefficient and the current value of the coal quality correction coefficient; A correction module is used to perform coal quality correction on the unit according to the updated coal quality correction coefficient when the coal quality correction coefficient is updated.

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