Primary air temperature compensation control method and device for coal-fired unit

Abstract

This application relates to the field of thermal power generation technology, and particularly to a method and apparatus for primary air temperature compensation control in coal-fired power units. The coal-fired power unit has a flue gas passage and a solid heat storage device. The method includes: determining the target primary air temperature of the target coal-fired power unit based on real-time operating data; calculating the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit to determine the control target of the solid heat storage device; and controlling the primary air passage and flue gas passage of the solid heat storage device to switch to the operating state corresponding to the control target based on the actual unit load of the target coal-fired power unit, thereby achieving primary air temperature compensation. This application can effectively utilize flue gas waste heat and dynamically compensate for primary air temperature by collecting, storing, and transferring it to the primary air temperature rise under low-load conditions, thereby enhancing the combustion stability of the coal-fired power unit under low-load peak-shaving conditions.

Description

Technical Field

[0001] This application relates to the field of thermal power generation technology, and in particular to a method and device for primary air temperature compensation control of a coal-fired unit. Background Technology

[0002] When a coal-fired power unit operates under low load, the outlet flue gas temperature of the furnace will decrease, and the heat exchange of the air preheater will also decrease, resulting in a lower primary air temperature. This seriously affects the combustion stability of the furnace and the ignition point of pulverized coal, causing a further decrease in boiler thermal efficiency.

[0003] In related technologies, to address the problem of low primary air temperature, the main methods used are to increase oxygen levels, activate fuel oil for stable combustion, or adjust the air-fuel ratio to provide auxiliary heating for the primary air temperature, thereby maintaining the primary air temperature to meet the requirements and ensuring the stability of boiler combustion.

[0004] However, the solutions to the problem of low primary air temperature in related technologies, such as increasing oxygen content, stabilizing fuel combustion, or adjusting the air-coal ratio, have various limitations. They may not be able to solve the problem of low primary air temperature when the coal-fired unit is operating at low load, or they may reduce the temperature of the flue gas entering the air preheater, thus affecting the activity of the subsequent SCR denitrification catalyst. They may also have drawbacks such as increased energy consumption, high operating costs, and poor peak-shaving economy. Therefore, they are difficult to effectively meet the needs of solving the problem of low primary air temperature in actual operation of coal-fired units and urgently need to be addressed. Summary of the Invention

[0005] This application provides a primary air temperature compensation control method and device for coal-fired power units, which addresses the problem of low primary air temperature in related technologies. However, these methods have various limitations, such as being unsuitable for low-load operation of coal-fired power units, affecting the operation of other components of the coal-fired power units, or suffering from defects such as increased energy consumption, high operating costs, and poor peak-shaving economy. Therefore, they are difficult to effectively meet the needs of solving the problem of low primary air temperature in actual operation of coal-fired power units.

[0006] The first aspect of this application provides a primary air temperature compensation control method for a coal-fired power unit. The coal-fired power unit has a flue gas passage and a solid heat storage device. The solid heat storage device adopts a single heat storage body with a dual-channel structure for storing the heat of the flue gas from the coal-fired power unit and transferring the heat of the flue gas to a coal mill. The method includes the following steps: determining the target primary air temperature of the target coal-fired power unit based on real-time operating data; calculating the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit to determine the control target of the solid heat storage device based on the temperature difference; and controlling the primary air passage and flue gas passage of the solid heat storage device to switch to the operating state corresponding to the control target based on the actual unit load of the target coal-fired power unit, so as to achieve the purpose of primary air temperature compensation.

[0007] Optionally, in one embodiment of this application, before determining the target primary air temperature of the target coal-fired power unit based on the real-time operating data of the coal-fired power unit, the method further includes: acquiring the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter of the target coal-fired power unit; and determining the real-time operating data based on the actual unit load, the primary air temperature, the flue gas temperature, the coal mill output, and the coal volatile matter.

[0008] Optionally, in one embodiment of this application, determining the control objective of the solid thermal storage device based on the temperature difference includes: when the temperature difference is within the preset temperature dead zone, determining the control objective as a first objective of maintaining the temperature difference within the preset temperature dead zone; and when the temperature difference is not within the preset temperature dead zone, determining the control objective as a second objective.

[0009] Optionally, in one embodiment of this application, controlling the primary air duct and flue gas duct of the solid thermal storage device to switch to the operating state corresponding to the control target based on the current load of the target coal-fired unit includes: comparing the actual unit load with a first preset load threshold to obtain a comparison result; when the temperature difference is not in the preset temperature dead zone and the comparison result is that the actual unit load is less than the first preset load threshold, controlling the primary air duct to switch to the open state corresponding to the second target, and controlling the flue gas duct to switch to the closed state corresponding to the second target.

[0010] Optionally, in one embodiment of this application, controlling the primary air passage and flue gas passage of the solid thermal storage device to switch to the operating state corresponding to the control target based on the current load of the target coal-fired unit includes: comparing the actual unit load with a first preset load threshold to obtain a comparison result; when the temperature difference is not in the preset temperature dead zone and the comparison result is that the actual unit load is greater than or equal to a second preset load threshold, controlling the primary air passage in the solid thermal storage device to switch to the closed state corresponding to the second target, and controlling the flue gas passage to switch to the open state corresponding to the control target, wherein the second preset load threshold is greater than the first preset load threshold.

[0011] A second aspect of this application provides a primary air temperature compensation control device for a coal-fired power unit, comprising: a first determining module, configured to determine a target primary air temperature of the target coal-fired power unit based on real-time operating data of the target coal-fired power unit; a calculation module, configured to calculate the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit, so as to determine a control target for the solid thermal energy storage device based on the temperature difference; and a control module, configured to control the primary air channel and flue gas channel of the solid thermal energy storage device to switch to an operating state corresponding to the control target based on the actual unit load of the target coal-fired power unit, so as to achieve the purpose of primary air temperature compensation.

[0012] Optionally, in one embodiment of this application, it further includes: an acquisition module, configured to acquire the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter of the target coal-fired unit before determining the target primary air temperature of the target coal-fired unit based on the real-time operating data of the coal-fired unit; and a second determination module, configured to determine the real-time operating data based on the actual unit load, the primary air temperature, the flue gas temperature, the coal mill output, and the coal volatile matter.

[0013] Optionally, in one embodiment of this application, the first determining module includes: a first determining unit, configured to determine the control target as a first target of maintaining the temperature difference within the preset temperature dead zone when the temperature difference is within the preset temperature dead zone; and a second determining unit, configured to determine the control target as a second target when the temperature difference is not within the preset temperature dead zone.

[0014] Optionally, in one embodiment of this application, the control module includes: a first comparison unit, configured to compare the actual unit load with a first preset load threshold to obtain a comparison result; and a first control unit, configured to control the primary air duct to switch to the open state corresponding to the second target and control the flue gas duct to switch to the closed state corresponding to the second target when the temperature difference is not in the preset temperature dead zone and the comparison result is that the actual unit load is less than the first preset load threshold.

[0015] Optionally, in one embodiment of this application, the control module includes: a second comparison unit, configured to compare the actual unit load with a first preset load threshold to obtain a comparison result; and a second control unit, configured to, when the temperature difference is not within the preset temperature dead zone and the comparison result is that the actual unit load is greater than or equal to the second preset load threshold, control the primary air duct in the solid thermal storage device to switch to a closed state corresponding to the second target, and control the flue gas duct to switch to an open state corresponding to the control target, wherein the second preset load threshold is greater than the first preset load threshold.

[0016] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the primary air temperature compensation control method for a coal-fired unit as described in the above embodiments.

[0017] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described primary air temperature compensation control method for a coal-fired power unit.

[0018] A fifth aspect of this application provides a computer program product, including a computer program that, when executed, is used to implement the above-described primary air temperature compensation control method for coal-fired power units.

[0019] This application embodiment determines the control target of the solid thermal energy storage device by calculating the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit. Then, based on the actual unit load of the target coal-fired power unit, it controls the switching of the primary air channel and flue gas channel to the operating state corresponding to the control target. Thus, the temperature difference between the primary air temperatures and the actual unit load are used as two independent judgment dimensions for collaborative decision-making. The temperature difference is used to determine whether primary air temperature compensation is needed, and the actual unit load is used to determine whether the solid thermal energy storage device needs heat storage compensation or heat release compensation. This achieves decoupled control of heat storage and heat release, ensuring accurate and timely compensation of the primary air temperature of the target coal-fired power unit, avoiding energy waste, and effectively ensuring that the direction of primary air temperature compensation matches the actual operating state of the coal-fired power unit. This avoids unnecessary heat release when the coal-fired power unit is under high load or ineffective heat storage when the coal-fired power unit is under low load. Ultimately, while ensuring the safe operation of the coal-fired power unit, it significantly improves the operational safety and economy of the coal-fired power unit under deep peak-shaving conditions. Therefore, the solutions to the problem of low primary air temperature in related technologies have various limitations. They may not be applicable to the low-load operation of coal-fired units, or they may affect the operation of other components of coal-fired units, or they may have defects such as increased energy consumption, high operating costs, and poor peak-shaving economy. As a result, they are difficult to effectively meet the needs of solving the problem of low primary air temperature in actual operation of coal-fired units.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a primary air temperature compensation control method for a coal-fired power unit according to an embodiment of this application; Figure 2 This is a schematic diagram of a dynamic compensation system for primary air temperature during low-load operation of a coal-fired unit according to an embodiment of this application. Figure 3 This is a schematic diagram of a dual-channel solid heat storage device according to an embodiment of this application; Figure 4 This is a logical schematic diagram of a dynamic compensation control method for primary air temperature of a coal-fired unit according to an embodiment of this application; Figure 5 This is a schematic diagram of the primary air temperature compensation control device for a coal-fired power unit provided in the embodiments of this application; Figure 6This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application.

[0022] Figure label: 10- Primary air temperature compensation control device for coal-fired power units; 100- First determination module, 200- Calculation module and 300- Control module; 601- Memory, 602- Processor and 603- Communication interface. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0024] The primary air temperature compensation control method and apparatus for a coal-fired power unit according to embodiments of this application are described below with reference to the accompanying drawings. Addressing the problems in the related technologies mentioned in the background section, this application provides a primary air temperature compensation control method for a coal-fired power unit. In this method, the control target of the solid thermal storage device can be determined by calculating the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit. Then, based on the actual unit load of the target coal-fired power unit, the primary air passage and flue gas passage are switched to the operating state corresponding to the control target. Therefore, by using the temperature difference between primary air temperatures and the actual unit load as two independent judgment dimensions for collaborative decision-making, the temperature difference is used to determine whether primary air temperature compensation is needed, and the actual unit load is used to determine whether the solid thermal storage device needs heat storage compensation or heat release compensation. This achieves decoupled control of heat storage and heat release, ensuring accurate and timely compensation of the primary air temperature of the target coal-fired unit to avoid energy waste. At the same time, it effectively ensures that the direction of primary air temperature compensation matches the actual operating state of the coal-fired unit, avoiding unnecessary heat release when the coal-fired unit is under high load or ineffective heat storage when the coal-fired unit is under low load. Ultimately, while ensuring the safe operation of the coal-fired unit, it significantly improves the operational safety and economy of the coal-fired unit under deep peak shaving conditions. Therefore, the solutions to the problem of low primary air temperature in related technologies have various limitations. They may not be applicable to the low-load operation of coal-fired units, or they may affect the operation of other components of coal-fired units, or they may have defects such as increased energy consumption, high operating costs, and poor peak-shaving economy. As a result, they are difficult to effectively meet the needs of solving the problem of low primary air temperature in actual operation of coal-fired units.

[0025] With the large-scale grid connection of new energy sources, coal-fired power units are gradually undertaking the task of deep peak shaving, and the operating load of the units has expanded from the traditional 70% to 100% rated load to the 20% to 50% load range. Under low load operation, the outlet flue gas temperature of the furnace will decrease, and the heat exchange of the air preheater will also decrease, resulting in a problem of low primary air temperature. This seriously affects the combustion stability of the furnace and the ignition point of pulverized coal, causing a further decrease in boiler thermal efficiency.

[0026] In related technologies, coal-fired power units mainly maintain combustion stability by increasing oxygen content, stabilizing fuel oil combustion, or adjusting the air-coal ratio. However, this approach has problems such as increased energy consumption, high operating costs, and poor peak-shaving economics.

[0027] For example, some technical solutions propose dividing the primary air heating system into a first air heater and a second air heater, and using reheated cold-end steam to heat the primary air so that the primary air temperature meets the requirements. However, this method still cannot solve the problem of low primary air temperature under low-load operation conditions of coal-fired units.

[0028] For example, some technical solutions propose using the undersaturated water at the economizer outlet to heat the primary air, thereby solving the problem of high energy consumption for heating primary air with high-quality steam. However, this method will reduce the temperature of the flue gas entering the air preheater, affecting the activity of the subsequent SCR denitrification catalyst.

[0029] Furthermore, some technical solutions propose heating the primary air using boiler outlet flue gas. While this method can effectively solve the problem of low primary air temperature and achieve efficient utilization of flue gas heat, the system is relatively simple and cannot achieve precise control of primary air temperature when facing variable load operation of coal-fired units, resulting in potential energy waste. Therefore, it is not suitable for deep peak shaving conditions of coal-fired units.

[0030] Based on this, this application proposes a primary air temperature compensation control method for coal-fired power units. In this method, based on the designed flue gas passage and solid heat storage device, different primary air temperature compensations are performed according to the actual load of the coal-fired power unit when the primary air temperature is under different conditions. This solves the problems of poor furnace combustion stability and low boiler efficiency caused by low primary air temperature under low load operating conditions of coal-fired power units.

[0031] Specifically, Figure 1 This is a flowchart of a primary air temperature compensation control method for a coal-fired unit provided in an embodiment of this application.

[0032] The coal-fired unit has a flue gas passage and a solid heat storage device, which stores the heat of the flue gas and / or transfers the heat of the flue gas to the coal mill.

[0033] In some embodiments, this application designs a dynamic compensation system for primary air temperature during low-load operation of a coal-fired unit. In this system, a flue gas passage and a solid heat storage device are designed. The flue gas passage can be used to transport flue gas, and the solid heat storage device can store the heat of the flue gas and transfer the heat of the flue gas to the coal mill.

[0034] The dynamic compensation system for primary air temperature during low-load operation of the coal-fired unit can be integrated into the coal-fired unit.

[0035] For example, Figure 1 This is a schematic diagram of a dynamic compensation system for primary air temperature during low-load operation of a coal-fired power unit, according to an embodiment of this application. Figure 1 As shown: In this embodiment, a flue gas bypass (flue gas passage) can be added between the air preheater outlet and the electrostatic precipitator inlet. The flue gas bypass can transport flue gas with residual heat from the air preheater outlet. The flue gas bypass is equipped with an electric valve, which can adjust the amount of flue gas in the flue gas bypass by controlling the valve opening.

[0036] Furthermore, the flue gas bypass can be connected to a solid heat storage device. The bypass flue gas from the air preheater outlet can enter the solid heat storage device through the bypass valve of the flue gas bypass. The flue gas outlet of the solid heat storage device is connected to the electrostatic precipitator via a primary fan. Thus, the flue gas that no longer has residual heat after heat exchange can be introduced into the electrostatic precipitator.

[0037] In addition, the solid heat storage device is also equipped with a primary air duct. After the primary air is drawn out by the primary air fan, the primary air can enter the solid heat storage device through the primary air duct. After being heated by the waste heat of the bypass flue gas stored in the solid heat storage device, it forms hot primary air, which can enter the coal mill.

[0038] The solid heat storage device can be, but is not limited to, configured as a single heat storage body with a dual-channel structure. That is, the solid heat storage device can use only one heat storage body, but this heat storage body can have two channels. The heat storage body can be, but is not limited to, a solid heat storage unit with a central porous structure. Its medium can be heat storage spherical ceramic, alumina honeycomb ceramic, or magnesium aluminum spinel heat storage body, etc. The central porous structure of the heat storage medium can be used for heat exchange fluid flow and heat transfer.

[0039] The two channels are a hot flue gas channel (used to transport hot flue gas) and a cold primary air channel (used to transport cold primary air). The two channels are not connected to each other to avoid fluid contamination between the channels.

[0040] Furthermore, the flue gas duct and the cold primary air duct can be arranged with alternating flue gas through holes and primary air through holes, with a wall thickness of approximately 3 to 5 millimeters in between. This arrangement can effectively reduce the number of heat exchange devices. Figure 3 As shown, Figure 3 This is a schematic diagram of a dual-channel solid thermal storage device according to an embodiment of this application.

[0041] The system has two modes: heat storage and heat release. Under high load conditions (≥60% THA) of the coal-fired unit, the system can activate the heat storage mode: the flue gas vents are open and the primary air vents are closed. Under low load conditions (<40% THA) of the coal-fired unit, the system activates the heat release mode: the flue gas vents are closed and the primary air vents are open.

[0042] This application embodiment can design an energy transfer link from flue gas waste heat to heat storage and then to primary air. Through this link, the waste heat from the flue gas under high load conditions of the coal-fired unit can be collected and stored, and transferred to the primary air under low load conditions to raise the temperature. This not only achieves effective utilization of the waste heat from the flue gas, but also increases the temperature of the primary air, thereby improving the overall thermal efficiency of the coal-fired unit.

[0043] like Figure 2 As shown, the primary air temperature compensation control method for this coal-fired unit includes the following steps: In step S201, the target primary air temperature of the target coal-fired unit is determined based on the real-time operating data of the target coal-fired unit.

[0044] In some embodiments, when performing compensatory control on the primary air temperature of the target coal-fired unit, this application first needs to determine the target primary air temperature of the target coal-fired unit.

[0045] Here, the target coal-fired unit can be understood as the coal-fired unit subject to primary air temperature compensation control.

[0046] The target primary air temperature here can be understood as the primary air temperature that the control system expects to achieve under the current load of the coal-fired unit. At this target primary air temperature, the coal mill of the coal-fired unit can be guaranteed to have sufficient drying capacity, thereby ensuring normal ignition and stable combustion of pulverized coal.

[0047] In this embodiment of the application, the target primary air temperature can be obtained, but is not limited to, through real-time operating data of the coal-fired unit.

[0048] Optionally, in one embodiment of this application, before determining the target primary air temperature of the target coal-fired unit based on the real-time operating data of the coal-fired unit, the method further includes: acquiring the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter of the target coal-fired unit; and determining the real-time operating data based on the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter.

[0049] In some embodiments, the real-time operating data of the coal-fired power unit obtained in this application includes, but is not limited to, the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter content of the coal-fired power unit.

[0050] For example, the control system of a coal-fired power unit can acquire this data information in real time through various acquisition sensors connected to it.

[0051] Real-time operating data of the coal-fired power generating unit was collected, including: actual unit load P and primary air temperature T. PA Flue gas temperature T fg After obtaining data such as the coal mill output M and the volatile matter content VM of the coal, the target primary air temperature of the coal-fired unit can be determined using this information.

[0052] For example, the target primary air temperature of a coal-fired unit can be calculated using the following empirical formula: T set =a+b × P+c × VM+d × M in, T set The target primary air temperature is denoted as ; a, b, c, and d are all empirical coefficients, which can be set and adjusted by professionals in this field based on the actual situation and experience of coal-fired units. The embodiments in this application are only illustrative and do not impose specific limitations.

[0053] For example, the target primary air temperature can also be determined based on empirical values. T set For example: when the unit load P is at 100% THA, 50% THA, 30% THA, and 20% THA, the target primary air temperature T set The values ​​can be 300℃, 270℃, 250℃, and 240℃ respectively. The remaining target primary air temperatures can be obtained by interpolation based on the mapping relationship between these unit loads and target primary air temperatures.

[0054] Here, THA can be understood as full load or 100% rated load, and 20% THA refers to 20% of the unit's rated load.

[0055] Step S202: Calculate the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired unit, so as to determine the control target of the solid thermal storage device based on the temperature difference.

[0056] In some embodiments, after obtaining the target primary air temperature of the target unit, this application can calculate the temperature difference between the target primary air temperature and the current actual primary air temperature of the target coal-fired unit, so as to determine the control target of the solid thermal storage device based on the temperature difference between the two.

[0057] The following section provides a further explanation of how the control target of the solid thermal storage device is determined based on the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired unit in the embodiments of this application.

[0058] Optionally, in one embodiment of this application, determining the control objective of the solid thermal storage device based on the temperature difference includes: when the temperature difference is within a preset temperature dead zone, determining the control objective as a first objective of maintaining the temperature difference within the preset temperature dead zone; and when the temperature difference is not within the preset temperature dead zone, determining the control objective as a second objective.

[0059] In actual implementation, this application can determine the control target of the solid thermal storage device by comparing the temperature difference between the target primary air temperature and the current actual primary air temperature of the target coal-fired unit and the preset temperature dead zone.

[0060] In this context, the preset temperature dead zone can be understood as a pre-defined allowable fluctuation range of the actual primary air temperature of the coal-fired unit. The specific preset temperature dead zone can be set and adjusted by those skilled in the art based on the actual conditions and experience of the coal-fired unit. This embodiment is merely illustrative and does not impose any specific limitations.

[0061] If the temperature difference between the target primary air temperature and the current actual primary air temperature of the target coal-fired unit is within the preset temperature dead zone, that is, the actual primary air temperature is within the primary air temperature range that can meet the requirements of the coal-fired unit, even if the actual primary air temperature of the coal-fired unit is not completely consistent with the target primary air temperature, the control system of the coal-fired unit can also consider that the current actual primary air temperature of the coal-fired unit has met the requirements of the coal-fired unit, and no primary air temperature compensation control action is required. It is only necessary to maintain the coal-fired unit and the primary air temperature.

[0062] Therefore, when the temperature difference between the target primary air temperature and the current actual primary air temperature of the target coal-fired unit is within the preset temperature dead zone, the embodiments of this application can determine that the control objective of the solid thermal storage device is to maintain the temperature difference within the preset temperature dead zone as the first objective, that is, the first objective is to maintain the temperature difference within the preset temperature dead zone. In this case, the solid thermal storage device does not need to make any new actions, but only needs to continue to maintain the current operating state.

[0063] When the temperature difference between the target primary air temperature and the current actual primary air temperature of the target coal-fired unit is not within the preset temperature dead zone, it proves that the current actual primary air temperature of the coal-fired unit is in a primary air temperature range that cannot meet the requirements of the coal-fired unit, that is, the actual primary air temperature is low. Therefore, the control target of the solid thermal storage device is the second target at this time.

[0064] Specifically, this second target needs to be determined by the actual unit load of the target coal-fired unit: (1) When the temperature difference is greater than the preset temperature dead zone and the actual unit load of the target coal-fired unit is less than the first preset load threshold, the control target of the solid heat storage device, which is also the second target, is to enter the heat release mode, release the heat of the stored bypass flue gas to heat the primary air temperature, until the temperature difference returns to the preset temperature dead zone.

[0065] Here, the first preset load threshold can be understood as a pre-set load boundary value used to determine whether a coal-fired unit is operating at a low load, such as 30% THA or 40% THA. When the actual unit load of the target coal-fired unit is less than this value, it proves that the target coal-fired unit is currently operating at a low load.

[0066] The specific first preset load threshold can be set and adjusted by professionals in this field based on the actual situation and experience of coal-fired units. The embodiments in this application are only illustrative and do not impose specific limitations.

[0067] When the temperature difference between the target primary air temperature and the current actual primary air temperature of the target coal-fired unit is not within the preset temperature dead zone, but the actual unit load of the target coal-fired unit is less than the first preset load threshold, it proves that the target coal-fired unit is currently in a low-load operation state.

[0068] Under low load, boiler combustion intensity is low, and flue gas flow and temperature drop significantly. This means that the air preheater of the target coal-fired unit is already insufficient to heat the primary air to the target temperature. If this situation continues, the coal mill will have insufficient drying output due to the low primary air temperature, leading to damp coal powder, pipe blockage, and even boiler flameout. Therefore, the solid thermal storage device needs to release the heat stored in the bypass flue gas (by opening the primary air duct and releasing heat) to forcibly replenish the primary air, so that the primary air temperature can meet the immediate needs of the coal mill.

[0069] (2) When the temperature difference is greater than the preset temperature dead zone and the actual unit load of the target coal-fired unit is greater than or equal to the second preset load threshold, the control target of the solid heat storage device, which is the second target, is to enter the heat storage mode, that is, to store the heat of the bypass flue gas with residual heat transported by the flue gas bypass.

[0070] Here, the second preset load threshold can be understood as a pre-set load boundary value used to determine whether a coal-fired unit is operating at a high load. When the actual unit load of the target coal-fired unit is greater than or equal to this value, it proves that the target coal-fired unit is currently operating at a high load. Therefore, the second preset load threshold is greater than the first preset load threshold.

[0071] The specific second preset load threshold can be set and adjusted by professionals in this field based on the actual situation and experience of coal-fired units. The embodiments in this application are only illustrative and do not impose specific limitations.

[0072] When the temperature difference between the target primary air temperature and the current actual primary air temperature of the target coal-fired unit is not within the preset temperature dead zone, but the actual unit load of the target coal-fired unit is greater than or equal to the second preset load threshold, it proves that the target coal-fired unit is currently operating under high load.

[0073] The vigorous combustion of the boiler under high load means that the air preheater of the target coal-fired unit has sufficient heat. However, the actual primary air temperature of the target coal-fired unit is still too low (the temperature difference between the target primary air temperature and the target primary air temperature is not in the preset temperature dead zone). This usually indicates that the air preheater itself has an abnormal operation (such as ash blockage, cold end corrosion, etc.) or that the heat storage body itself has insufficient temperature reserve.

[0074] In this situation, given the high furnace temperature under high load, even a slight decrease in primary air temperature will not cause flameout, so the current safety of the coal-fired unit will not be significantly affected. However, if the air preheater cannot heat the primary air to the target primary air temperature under high load, and the actual unit load of the target coal-fired unit decreases further, then the safety of the coal-fired unit will be immediately threatened.

[0075] Therefore, at this time, the solid heat storage device needs to store heat in a timely manner when the unit is under high load and the flue gas has sufficient heat (open the flue gas bypass valve, open the flue gas passage, and store heat in the heat storage body) in order to prepare for the deep peak shaving of the target coal-fired unit.

[0076] In summary, the control system can detect the temperature difference of the primary air temperature of the target coal-fired unit in real time. e： e = T set - T PA .

[0077] When the temperature difference| e |≤ T deadline (Preset temperature dead zone threshold) means that when the temperature difference is within the preset temperature dead zone, the control system maintains the current state. The control objective of the solid heat storage device is to maintain the current operating state. When the temperature difference |e|> T deadline When the temperature difference is not within the preset temperature dead zone, the control system can determine the control target of the solid thermal storage device based on the actual unit load of the coal-fired unit at the current moment. This means the solid thermal storage device should operate in the following mode: when the actual unit load... P Less than the first preset load threshold, for example P When the THA is <40%, the control system can control the solid thermal storage device to enter the heat release mode; when the unit load is <40%, the control system can control the solid thermal storage device to enter the heat release mode. P Greater than or equal to the second preset load threshold, for example P When the THA is ≥60%, the control system can control the solid thermal storage device to enter the thermal storage mode.

[0078] In the embodiments of this application, T deadline The preset temperature dead zone can be set to 5℃, but is not limited to [-5℃, +5℃]. The specific preset temperature dead zone can be set and adjusted by those skilled in the art based on the actual conditions of the coal-fired unit or the unit's load. This embodiment is merely illustrative and does not impose any specific limitations.

[0079] Step S203: Based on the actual unit load of the target coal-fired unit, control the primary air passage and flue gas passage of the solid thermal storage device to switch to the working state corresponding to the control target, so as to achieve the purpose of primary air temperature compensation.

[0080] Based on the descriptions of other embodiments, it will be understood that the control target of the solid thermal storage device needs to be determined in some cases according to the actual unit load of the target coal-fired unit.

[0081] Based on this, in actual implementation, this application can control the solid thermal energy storage device to perform its due control target based on the actual unit load of the target coal-fired unit. That is, it controls the primary air passage and flue gas passage of the solid thermal energy storage device to switch to the working state corresponding to the control target of the solid thermal energy storage device, so as to achieve the purpose of primary air temperature compensation of the target coal-fired unit.

[0082] This application embodiment determines the control target of the solid thermal energy storage device by calculating the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit. Then, based on the actual unit load of the target coal-fired power unit, it controls the switching of the primary air channel and flue gas channel to the operating state corresponding to the control target. Thus, the temperature difference between the primary air temperatures and the actual unit load are used as two independent judgment dimensions for collaborative decision-making. The temperature difference is used to determine whether primary air temperature compensation is needed, and the actual unit load is used to determine whether the solid thermal energy storage device needs heat storage compensation or heat release compensation. This achieves decoupled control of heat storage and heat release, ensuring accurate and timely compensation of the primary air temperature of the target coal-fired power unit, avoiding energy waste, and effectively ensuring that the direction of primary air temperature compensation matches the actual operating state of the coal-fired power unit. This avoids unnecessary heat release when the coal-fired power unit is under high load or ineffective heat storage when the coal-fired power unit is under low load. Ultimately, while ensuring the safe operation of the coal-fired power unit, it significantly improves the operational safety and economy of the coal-fired power unit under deep peak-shaving conditions.

[0083] Optionally, in one embodiment of this application, based on the current load of the target coal-fired unit, controlling the primary air duct and flue gas duct of the solid thermal storage device to switch to the working state corresponding to the control target includes: comparing the actual unit load with a first preset load threshold to obtain a comparison result; when the temperature difference is not in the preset temperature dead zone and the comparison result is that the actual unit load is less than the first preset load threshold, controlling the primary air duct to switch to the open state corresponding to the second target, and controlling the flue gas duct to switch to the closed state corresponding to the second target.

[0084] In some embodiments, when the application switches the primary air channel and flue gas channel of the solid thermal storage device to the working state corresponding to the control target of the solid thermal storage device based on the current load of the target coal-fired unit, it can first compare the actual unit load with the first preset load threshold.

[0085] When the temperature difference is not within the preset temperature dead zone and the actual unit load is less than the first preset load threshold, the embodiments of this application can control the primary air channel in the solid heat storage device to switch to the open state corresponding to the second target, and control the flue gas channel to switch to the closed state corresponding to the second target.

[0086] For example, Figure 4 This is a logical schematic diagram of a dynamic compensation control method for primary air temperature of a coal-fired unit according to an embodiment of this application, as shown below. Figure 4 As shown: When the primary wind temperature deviation e>T deadline And the unit load P When the THA is less than 40%, the primary air temperature can be increased by using a solid heat storage device in this embodiment of the application. At this time, the flue gas bypass valve is closed and the primary air passage valve is opened.

[0087] Specifically, embodiments of this application can use PID to calculate the current required heat release power of the target coal-fired unit. Q release ： Q release = K p × e + K i ×Σ edt + K d ×( de / dt ), Then, the embodiments of this application can determine the heat storage capacity of the solid thermal storage device. E storage With the required heat dissipation power Q release The corresponding required heat release E out Relationship: like E storage > E out The control system can then control the solid thermal storage device to execute a heat release command, that is, control the solid thermal storage device to enter the heat release operation mode. This allows the primary air temperature to be increased through the solid thermal storage device until the primary air temperature deviates from the set temperature. e ≤ T deadline .

[0088] like E storage ≤ E outThe control system can issue a low heat storage warning, and at the same time continue to heat the primary air through the electric heating device (primary air fan) at the back end of the solid heat storage device until the primary air temperature deviates from the warning level. e ≤ T deadline .

[0089] Among them, thermal storage capacity E storage The required heat release can be obtained, but is not limited to, through the temperature, volume, and heat storage coefficient of the solid heat storage unit; E out It can be achieved, but is not limited to, through heat release power. Q release The specific heat storage capacity is obtained from the heat release time. E storage and the required heat release E out The calculation method can be set and adjusted by those skilled in the art according to the actual situation of the coal-fired unit. The embodiments in this application are only illustrative and are not specific.

[0090] Optionally, in one embodiment of this application, based on the current load of the target coal-fired unit, controlling the primary air passage and flue gas passage of the solid thermal storage device to switch to the working state corresponding to the control target includes: comparing the actual unit load with a first preset load threshold to obtain a comparison result; when the temperature difference is not in the preset temperature dead zone and the comparison result is that the actual unit load is greater than or equal to a second preset load threshold, controlling the primary air passage in the solid thermal storage device to switch to the closed state corresponding to the second target, and controlling the flue gas passage to switch to the open state corresponding to the control target, wherein the second preset load threshold is greater than the first preset load threshold.

[0091] In other embodiments, when the temperature difference is not within the preset temperature dead zone and the actual unit load is greater than or equal to the second preset load threshold, the embodiments of this application can control the primary air channel in the solid heat storage device to switch to the closed state corresponding to the second target, and control the flue gas channel to switch to the open state corresponding to the second target.

[0092] For example, as Figure 4 As shown, when the primary air temperature deviation e > T deadline And the unit load P When the THA is ≥60%, the embodiment of this application can increase the heat storage capacity in the solid heat storage device by using the waste heat of the flue gas: at this time, the control system can control the opening of the flue gas bypass valve and control the closing of the primary air passage valve and primary air channel in the solid heat storage device.

[0093] If the flue gas temperature Tfg < T fg,min You can stop heat storage and close the flue gas bypass valve.

[0094] in, T fg,min This is the minimum permissible value for flue gas temperature. T fg,min = T 酸露点 + ΔT safe , ΔT safe It can be set to 20℃, but is not limited to that.

[0095] This application embodiment can achieve dynamic compensation control of the primary air temperature of a coal-fired power unit based on the load and primary air temperature deviation of the unit, through a solid thermal storage mode under high load and a solid thermal storage mode under low load. Furthermore, this application embodiment can also dynamically adjust the storage / release power based on the primary air temperature deviation, enhancing the combustion stability of the coal-fired power unit under low load peak-shaving conditions, and ensuring the stability of furnace combustion by increasing the primary air temperature under low load peak-shaving conditions.

[0096] The following specific embodiments illustrate the primary air temperature compensation control method for coal-fired power units in this application.

[0097] by Figure 1 The following is an example of a dynamic primary air temperature compensation system for a coal-fired unit under low load operation, consisting of a flue gas bypass, bypass valves, a primary air duct, and a solid thermal storage device: The system operates in heat storage mode under high load (≥60% THA) and in heat release mode under low load (<40% THA). In heat storage mode, flue gas from the air preheater outlet enters the solid-state heat storage device via a flue gas bypass, and after heat exchange, enters the electrostatic precipitator. In heat release mode, primary air enters the solid-state heat storage device via the primary air duct, and after heat exchange, enters the coal mill. The solid-state heat storage device uses alumina honeycomb ceramic as its medium. The hot flue gas duct and the cold primary air duct are not interconnected, and the through holes are arranged in an alternating pattern with a central wall thickness of 5 mm.

[0098] When the coal-fired power unit is at 30% load, set T deadline The target primary air temperature is calculated using an empirical formula, with a set value of 10℃. T set The actual primary air temperature is 250℃. T PA The primary air temperature deviation is 215℃. e=35℃. At this point, the system enters heat release mode, requiring the primary air temperature to be increased via a solid-state heat storage device: the flue gas bypass valve is closed, and the primary air passage valve is opened. The calculated heat storage capacity of the solid-state heat storage device is then determined. E storage =50MJ, required heat release E out =40MJ, the system executes the heat release command, raising the primary air temperature to 243℃ through the solid heat storage device. At this time, the primary air passage valve is closed, and heating stops.

[0099] When the coal-fired unit load is 25%, set T deadline The target primary air temperature is calculated using an empirical formula, with a set value of 10℃. T set The actual primary air temperature is 245℃. T PA The primary air temperature deviation is 215℃. e =40℃. At this point, the system enters heat release mode, requiring the primary air temperature to be increased via a solid-state heat storage device: the flue gas bypass valve is closed, and the primary air passage valve is opened. The calculated heat storage capacity of the solid-state heat storage device is then determined. E storage =50MJ, required heat release E out =60MJ, the system executes the heat release command, first raising the primary air temperature through the solid heat storage device, and then further raising the primary air temperature to 243℃ through the electric heater. At this time, the primary air passage valve is closed, and heating stops.

[0100] Unit load P When the primary air temperature deviation is 80% THA, the calculated deviation is... e The temperature is 15℃. At this point, the system enters heat storage mode, raising the temperature of the solid heat storage device through flue gas. The flue gas bypass valve opens, and the primary air passage valve closes. During the heating process, the flue gas temperature... T fg The temperature drops from 180℃ to 150℃, at which point the flue gas temperature is below the minimum allowable value. T fg,min =152℃ T 酸露点 It is 130℃. ΔT safe (At 20℃), stop heating and close the flue gas bypass valve.

[0101] According to the primary air temperature compensation control method for coal-fired power units proposed in this application, the control target of the solid thermal energy storage device can be determined by calculating the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit. Then, based on the actual unit load of the target coal-fired power unit, the primary air channel and flue gas channel are switched to the working state corresponding to the control target. Thus, the temperature difference between the primary air temperatures and the actual unit load are used as two independent judgment dimensions for collaborative decision-making. The temperature difference is used to determine whether primary air temperature compensation is needed, and the actual unit load is used to determine whether the solid thermal energy storage device needs heat storage compensation or heat release compensation. This achieves decoupled control of heat storage and heat release, ensuring accurate and timely compensation of the primary air temperature of the target coal-fired power unit, avoiding energy waste, and effectively ensuring that the direction of primary air temperature compensation matches the actual operating state of the coal-fired power unit. This avoids unnecessary heat release when the coal-fired power unit is under high load or ineffective heat storage when the coal-fired power unit is under low load. Ultimately, while ensuring the safe operation of the coal-fired power unit, it significantly improves the operational safety and economy of the coal-fired power unit under deep peak shaving conditions. Therefore, the solutions to the problem of low primary air temperature in related technologies have various limitations. They may not be applicable to the low-load operation of coal-fired units, or they may affect the operation of other components of coal-fired units, or they may have defects such as increased energy consumption, high operating costs, and poor peak-shaving economy. As a result, they are difficult to effectively meet the needs of solving the problem of low primary air temperature in actual operation of coal-fired units.

[0102] Next, referring to the accompanying drawings, a primary air temperature compensation control device for a coal-fired unit according to an embodiment of this application is described.

[0103] Figure 5 This is a schematic diagram of the primary air temperature compensation control device for a coal-fired unit according to an embodiment of this application.

[0104] like Figure 5 As shown, the primary air temperature compensation control device 10 of the coal-fired unit includes: a first determination module 100, a calculation module 200 and a control module 300.

[0105] The first determining module 100 is used to determine the target primary air temperature of the target coal-fired unit based on the real-time operating data of the target coal-fired unit; the calculation module 200 is used to calculate the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired unit, so as to determine the control target of the solid thermal energy storage device based on the temperature difference; the control module 300 is used to control the primary air channel and flue gas channel of the solid thermal energy storage device to switch to the working state corresponding to the control target based on the actual unit load of the target coal-fired unit, so as to achieve the purpose of primary air temperature compensation.

[0106] Optionally, in one embodiment of this application, it further includes: an acquisition module, used to acquire the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter of the target coal-fired unit before determining the target primary air temperature of the target coal-fired unit based on the real-time operating data of the coal-fired unit; and a second determination module, used to determine the real-time operating data based on the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter.

[0107] Optionally, in one embodiment of this application, the first determining module 100 includes: a first determining unit, configured to determine the control target as a first target of maintaining the temperature difference within the preset temperature dead zone when the temperature difference is within the preset temperature dead zone; and a second determining unit, configured to determine the control target as a second target when the temperature difference is not within the preset temperature dead zone.

[0108] Optionally, in one embodiment of this application, the control module 300 includes: a first comparison unit, used to compare the actual unit load with a first preset load threshold to obtain a comparison result; and a first control unit, used to control the primary air duct to switch to the open state corresponding to the second target and control the flue gas duct to switch to the closed state corresponding to the second target when the temperature difference is not in the preset temperature dead zone and the comparison result is that the actual unit load is less than the first preset load threshold.

[0109] Optionally, in one embodiment of this application, the control module 300 includes: a second comparison unit, used to compare the actual unit load with a first preset load threshold to obtain a comparison result; and a second control unit, used to control the primary air channel in the solid heat storage device to switch to a closed state corresponding to the second target and control the flue gas channel to switch to an open state corresponding to the control target when the temperature difference is not in the preset temperature dead zone and the comparison result is that the actual unit load is greater than or equal to the second preset load threshold, wherein the second preset load threshold is greater than the first preset load threshold.

[0110] It should be noted that the explanation of the aforementioned embodiment of the primary air temperature compensation control method for coal-fired units also applies to the primary air temperature compensation control device of the coal-fired unit in this embodiment, and will not be repeated here.

[0111] According to the primary air temperature compensation control device for coal-fired power units proposed in this application, the control target of the solid thermal storage device can be determined by calculating the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired power unit. Then, based on the actual unit load of the target coal-fired power unit, the primary air channel and flue gas channel are switched to the working state corresponding to the control target. Thus, the temperature difference between the primary air temperatures and the actual unit load are used as two independent judgment dimensions for collaborative decision-making. The temperature difference is used to determine whether primary air temperature compensation is needed, and the actual unit load is used to determine whether the solid thermal storage device needs heat storage compensation or heat release compensation. This achieves decoupled control of heat storage and heat release, ensuring accurate and timely compensation of the primary air temperature of the target coal-fired power unit, avoiding energy waste, and effectively ensuring that the direction of primary air temperature compensation matches the actual operating state of the coal-fired power unit. This avoids unnecessary heat release when the coal-fired power unit is under high load or ineffective heat storage when the coal-fired power unit is under low load. Ultimately, while ensuring the safe operation of the coal-fired power unit, it significantly improves the operational safety and economy of the coal-fired power unit under deep peak shaving conditions. Therefore, the solutions to the problem of low primary air temperature in related technologies have various limitations. They may not be applicable to the low-load operation of coal-fired units, or they may affect the operation of other components of coal-fired units, or they may have defects such as increased energy consumption, high operating costs, and poor peak-shaving economy. As a result, they are difficult to effectively meet the needs of solving the problem of low primary air temperature in actual operation of coal-fired units.

[0112] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 601, the processor 602, and the computer program stored on the memory 601 and capable of running on the processor 602.

[0113] When the processor 602 executes the program, it implements the primary air temperature compensation control method for coal-fired power units provided in the above embodiments.

[0114] Furthermore, electronic devices also include: Communication interface 603 is used for communication between memory 601 and processor 602.

[0115] The memory 601 is used to store computer programs that can run on the processor 602.

[0116] The memory 601 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0117] If the memory 601, processor 602, and communication interface 603 are implemented independently, then the communication interface 603, memory 601, and processor 602 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0118] Optionally, in a specific implementation, if the memory 601, processor 602, and communication interface 603 are integrated on a single chip, then the memory 601, processor 602, and communication interface 603 can communicate with each other through an internal interface.

[0119] The processor 602 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0120] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described primary air temperature compensation control method for coal-fired power units.

[0121] This application also provides a computer program product, including a computer program that can run computer instructions. When the computer instructions are executed by a processor, they implement the primary air temperature compensation control method for coal-fired power units provided in this application.

[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0123] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0124] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0125] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0126] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0127] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0128] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0129] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A method for primary air temperature compensation control in a coal-fired power unit, characterized in that, The coal-fired power unit has a flue gas passage and a solid heat storage device. The solid heat storage device adopts a single heat storage body with a dual-channel structure, used to store the heat of the flue gas from the coal-fired power unit and to transfer the heat of the flue gas to the coal mill. The method includes the following steps: The target primary air temperature of the target coal-fired unit is determined based on the real-time operating data of the target coal-fired unit. Calculate the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired unit, and determine the control target of the solid thermal storage device based on the temperature difference; Based on the actual unit load of the target coal-fired unit, the primary air passage and flue gas passage of the solid thermal storage device are switched to the working state corresponding to the control target in order to achieve the purpose of primary air temperature compensation.

2. The method according to claim 1, characterized in that, Before determining the target primary air temperature of the target coal-fired power unit based on real-time operating data of the coal-fired power unit, the process also includes: Obtain the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter of the target coal-fired unit; The real-time operating data is determined based on the actual unit load, the primary air temperature, the flue gas temperature, the coal mill output, and the volatile matter content of the coal.

3. The method according to claim 1, characterized in that, Determining the control objective of the solid thermal storage device based on the temperature difference includes: When the temperature difference is within a preset temperature dead zone, the control objective is determined to be a first objective of maintaining the temperature difference within the preset temperature dead zone; When the temperature difference is not within the preset temperature dead zone, the control target is determined to be the second target.

4. The method according to claim 3, characterized in that, The step of controlling the primary air passage and flue gas passage of the solid thermal storage device to switch to the operating state corresponding to the control target based on the current load of the target coal-fired unit includes: The actual unit load is compared with the first preset load threshold to obtain the comparison result; When the temperature difference is not within the preset temperature dead zone and the comparison result is that the actual unit load is less than the first preset load threshold, the primary air duct is controlled to switch to the open state corresponding to the second target, and the flue gas duct is controlled to switch to the closed state corresponding to the second target.

5. The method according to claim 3, characterized in that, The step of controlling the primary air passage and flue gas passage of the solid thermal storage device to switch to the operating state corresponding to the control target based on the current load of the target coal-fired unit includes: The actual unit load is compared with the first preset load threshold to obtain the comparison result; When the temperature difference is not within the preset temperature dead zone and the comparison result is that the actual unit load is greater than or equal to the second preset load threshold, the primary air channel in the solid heat storage device is controlled to switch to the closed state corresponding to the second target, and the flue gas channel is controlled to switch to the open state corresponding to the control target, wherein the second preset load threshold is greater than the first preset load threshold.

6. A primary air temperature compensation control device for a coal-fired power unit, characterized in that, include: The first determining module is used to determine the target primary air temperature of the target coal-fired unit based on the real-time operating data of the target coal-fired unit. The calculation module is used to calculate the temperature difference between the target primary air temperature and the actual primary air temperature of the target coal-fired unit, so as to determine the control target of the solid thermal storage device based on the temperature difference. The control module is used to control the primary air passage and flue gas passage of the solid thermal storage device to switch to the working state corresponding to the control target based on the actual unit load of the target coal-fired unit, so as to achieve the purpose of primary air temperature compensation.

7. The apparatus according to claim 6, characterized in that, Also includes: The acquisition module is used to acquire the actual unit load, primary air temperature, flue gas temperature, coal mill output, and coal volatile matter of the target coal-fired unit before determining the target primary air temperature of the target coal-fired unit based on the real-time operating data of the coal-fired unit. The second determining module is used to determine the real-time operating data based on the actual unit load, the primary air temperature, the flue gas temperature, the coal mill output, and the volatile matter content of the coal.

8. An electronic device, characterized in that, include: The memory, the processor, and the computer program stored in the memory and executable on the processor, the processor executing the program to implement the primary air temperature compensation control method for a coal-fired unit as described in any one of claims 1-5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the primary air temperature compensation control method for coal-fired power units as described in any one of claims 1-5.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed, it is used to implement the primary air temperature compensation control method for coal-fired power units as described in any one of claims 1-5.

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