Heat storage type anti-freezing heat supply method and device, electronic equipment and storage medium

Abstract

The invention provides a heat storage type anti-freezing heat supply method and device, electronic equipment and a storage medium, and relates to the technical field of thermal power heat supply system optimization. The method comprises the following steps: adjusting steam extraction of a pressure cylinder in a steam turbine to be distributed to at least two targets of water feeding pump driving, heat storage and heat supply network heat supply, and controlling a heat storage device to supply anti-freezing heat to an indirect air cooling system when a unit enters a small-volume flow running mode, the distribution path of the heat supply network return water is dynamically adjusted according to the heat supply network return water state and the heat storage state of the heat storage device to achieve heat supply and anti-freezing cooperative control, and therefore the problems that in the prior art, due to the fact that cooling steam is insufficient during small-volume flow operation, an air cooling fan section is prone to frost cracking, heat supply network supply and demand matching is unbalanced, and peak regulation and heat supply are difficult to consider at the same time can be solved; the technical effects of guaranteeing stable operation of the unit in the low-temperature environment, improving the heat supply flexibility and reliability of the heat supply network and enhancing the power grid peak regulation adaptation capacity of the unit are achieved.

Description

Technical Field

[0001] This disclosure relates to the field of thermal power heating system optimization technology, and in particular to a heat storage antifreeze heating method and apparatus, electronic equipment and storage medium. Background Technology

[0002] Indirect air-cooled units are the core carriers for winter heating and grid peak shaving. In the flexible transformation of thermal power plants, small volume flow technology can realize dual-mode operation of "condensing mode + small volume flow mode", which can improve heating capacity and deep peak shaving effect. Energy storage devices (hot water energy storage, temperature layered storage) can store excess heat and release it on demand, which can alleviate the contradiction between peak shaving and heating.

[0003] However, in existing technologies, the two are used independently without establishing a coordinated mechanism for air cooling and antifreeze: when operating at small volume flow rates, insufficient cooling steam causes the working fluid temperature of the air-cooled tower sector to fall below the antifreeze threshold. Existing antifreeze solutions require additional cooling steam, which weakens peak-shaving capacity. The high-temperature working fluid of the energy storage device cannot participate in the heat compensation of the air-cooled system, resulting in heat waste during off-peak hours and difficulty in coping with insufficient load during peak hours. At extreme low temperatures below -20℃, the risk of sector freezing and cracking and the stability of heating supply are difficult to balance, becoming a key bottleneck restricting the upgrading of thermal power heating systems. Summary of the Invention

[0004] This disclosure provides a heat storage-type antifreeze heating method and apparatus, electronic equipment, and storage medium. Its main objective is to at least partially solve one of the technical problems in the related art.

[0005] According to a first aspect of this disclosure, a heat storage type antifreeze heating method is provided, comprising: Obtain the heating load demand of the heating network, and determine the current operating mode of the unit based on the demand; According to the operating mode, the distribution path of the extracted steam from the intermediate pressure cylinder of the steam turbine is adjusted to distribute the extracted steam to at least two of the following targets: feedwater pump drive, thermal storage, and heating network supply. When the unit enters the small volume flow operation mode, the control heat storage device supplies antifreeze heat to the indirect air-cooling system to maintain the antifreeze temperature of the air-cooled fan section. Based on the status of the return water in the heating network and the heat storage status of the heat storage device, the distribution path of the return water in the heating network between the heat storage device and the heating network heater is dynamically adjusted to achieve coordinated control of heating and antifreeze.

[0006] Optionally, determining the current operating mode of the unit based on the demand includes: Depending on whether the heating network load is in a low-load period, a high-load period, or a period of continuous high load, the appropriate mode should be selected: heat storage mode, heat release peak-supplementation mode, or small-volume flow antifreeze heating mode. And when the working fluid temperature of the indirect air-cooled system is detected to be lower than the antifreeze threshold, it is forcibly switched to the small volume flow antifreeze heating mode.

[0007] Optionally, adjusting the distribution path of the extraction steam from the intermediate pressure cylinder of the steam turbine includes: Dynamic control of the extraction steam flow rate is achieved by coordinating the operation of regulating valves installed in the connecting pipeline and the cooling steam bypass. Based on the power requirements of the feedwater pump, the remaining heat storage capacity of the heat storage device, and the real-time load of the heating network, the steam extraction flow rate is allocated to the feedwater pump drive, heat storage, and heating network supply according to a preset ratio.

[0008] Optionally, the control of the heat storage device to supply antifreeze heat to the indirect air-cooling system includes: By utilizing the temperature stratification structure within the heat storage device, the working fluid in the high-temperature zone is preferentially extracted and transported to the sector of the indirect air-cooling system. By adjusting the valve opening on the antifreeze heat supply pipeline, the supplied antifreeze heat flow rate is kept in a set ratio with the flow rate of cooling steam in the air-cooled fan section.

[0009] Optionally, the dynamic adjustment of the distribution path of the heat network return water between the heat storage device and the heat network heater includes: Compare the return water temperature of the heating network with the working fluid temperature in the low-temperature zone of the heat storage device, and determine whether to send the return water directly into the heating network heater or to first introduce it into the heat storage device for preheating based on the temperature difference. When the return water temperature of the heating network is lower than the set lower limit, the return water will be switched to flow into the low-temperature zone of the heat storage device for heat recovery.

[0010] Optional, also includes: Continuously monitor the working fluid temperature at the outlet of the indirect air-cooling system, and when this temperature is lower than the freezing critical temperature, increase the flow rate of antifreeze heat supplied by the heat storage device to the indirect air-cooling system.

[0011] According to a second aspect of this disclosure, a heat storage type anti-freeze heating device is provided, comprising: The acquisition unit is used to acquire the heating load demand of the heating network and determine the current operating mode of the unit based on the demand; The adjustment unit is used to adjust the distribution path of the steam extracted from the intermediate pressure cylinder of the steam turbine according to the operating mode, and distribute the extracted steam to at least two of the following targets: feedwater pump drive, thermal storage, and heating network supply. The control unit is used to control the heat storage device to supply antifreeze heat to the indirect air-cooling system when the unit enters the small volume flow operation mode, so as to maintain the antifreeze temperature of the air-cooled fan section. The regulating unit is used to dynamically adjust the distribution path of the heat network return water between the heat storage device and the heat network heater according to the heat network return water status and the heat storage status of the heat storage device, so as to realize the coordinated control of heating and antifreeze.

[0012] Optionally, the acquisition unit is also used for: Depending on whether the heating network load is in a low-load period, a high-load period, or a period of continuous high load, the appropriate mode should be selected: heat storage mode, heat release peak-supplementation mode, or small-volume flow antifreeze heating mode. And when the working fluid temperature of the indirect air-cooled system is detected to be lower than the antifreeze threshold, it is forcibly switched to the small volume flow antifreeze heating mode.

[0013] Optionally, the adjustment unit is also used for: Dynamic control of the extraction steam flow rate is achieved by coordinating the operation of regulating valves installed in the connecting pipeline and the cooling steam bypass. Based on the power requirements of the feedwater pump, the remaining heat storage capacity of the heat storage device, and the real-time load of the heating network, the steam extraction flow rate is allocated to the feedwater pump drive, heat storage, and heating network supply according to a preset ratio.

[0014] Optionally, the control unit is also used for: By utilizing the temperature stratification structure within the heat storage device, the working fluid in the high-temperature zone is preferentially extracted and transported to the sector of the indirect air-cooling system. By adjusting the valve opening on the antifreeze heat supply pipeline, the supplied antifreeze heat flow rate is kept in a set ratio with the flow rate of cooling steam in the air-cooled fan section.

[0015] Optionally, the adjustment unit is also used for: Compare the return water temperature of the heating network with the working fluid temperature in the low-temperature zone of the heat storage device, and determine whether to send the return water directly into the heating network heater or to first introduce it into the heat storage device for preheating based on the temperature difference. When the return water temperature of the heating network is lower than the set lower limit, the return water will be switched to flow into the low-temperature zone of the heat storage device for heat recovery.

[0016] Optional, also includes: The monitoring unit is used to continuously monitor the working fluid temperature at the outlet of the indirect air-cooling system, and when the temperature is lower than the freezing critical temperature, it increases the flow rate of antifreeze heat supplied by the heat storage device to the indirect air-cooling system.

[0017] According to a third aspect of this disclosure, an electronic device is provided, comprising: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method described in the first aspect above.

[0018] According to a fourth aspect of this disclosure, a non-transitory computer-readable storage medium is provided storing computer instructions, wherein the computer instructions are configured to cause the computer to perform the method described in the first aspect above.

[0019] According to a fifth aspect of this disclosure, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the method described in the first aspect above.

[0020] The heat storage antifreeze heating method, apparatus, electronic equipment, and storage medium disclosed herein acquire the heating load demand of the heating network and determine the current operating mode of the unit. They adjust the distribution of steam extracted from the intermediate pressure cylinder of the steam turbine to at least two of the following objectives: feedwater pump drive, heat storage, and heating network supply. When the unit enters a low-volume flow operation mode, the heat storage device is controlled to supply antifreeze heat to the indirect air-cooled system. Furthermore, the distribution path of the heat network return water is dynamically adjusted according to the state of the heat network return water and the heat storage state of the heat storage device to achieve coordinated control of heating and antifreeze. Therefore, it can solve the problems in the prior art where insufficient cooling steam during low-volume flow operation leads to easy freezing and cracking of air-cooled fan sections, imbalance between heating network supply and demand, and difficulty in balancing peak shaving and heating. This achieves the technical effects of ensuring stable operation of the unit in low-temperature environments, improving the flexibility and reliability of heating network supply, and strengthening the unit's grid peak shaving adaptability.

[0021] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0022] The accompanying drawings are provided to better understand this solution and do not constitute a limitation of this disclosure. Wherein: Figure 1 A schematic flowchart of a heat storage antifreeze heating method provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of a heat storage antifreeze heating device provided in an embodiment of the present disclosure; Figure 3 A schematic block diagram of an example electronic device provided for embodiments of this disclosure. Detailed Implementation

[0023] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0024] The following description, with reference to the accompanying drawings, describes a heat storage antifreeze heating method and apparatus, electronic equipment, and storage medium according to embodiments of the present disclosure.

[0025] Figure 1 This is a schematic flowchart of a heat storage antifreeze heating method provided in an embodiment of the present disclosure.

[0026] like Figure 1 As shown, the method includes the following steps: Step 101: Obtain the heating load demand of the heating network and determine the current operating mode of the unit based on the demand.

[0027] In the embodiments of this disclosure, firstly, the real-time heating load demand of the heating network served by the indirect air-cooled unit (hereinafter referred to as "indirect-cooled unit") is obtained through an adapted heating network load detection or feedback mechanism. This demand covers various load states exhibited by the heating network at different operating stages. Based on the obtained heating load demand, and considering the unit's operational safety, heating efficiency, and grid peak-shaving adaptability, the operating mode that the unit should currently adopt is determined. The operating mode must be able to provide an adapted operating basis for subsequent heat distribution and freeze protection. As one implementation method, the heating network load demand may include off-peak demand, short-term surge demand, and stable high load demand, etc. The corresponding unit operating modes may include traditional steam extraction mode, small volume flow mode, etc., to adapt to the coordinated requirements of heating, peak shaving, and freeze protection under different demands.

[0028] This step provides a precise demand basis for the subsequent heat distribution and coordinated control of the unit, ensuring that the unit's operating mode is highly compatible with the actual load demand of the heating network, laying the foundation for the coordinated optimization of heating, antifreeze and peak shaving, and improving the pertinence and flexibility of unit operation.

[0029] Step 102: According to the operating mode, adjust the distribution path of the extracted steam from the intermediate pressure cylinder of the steam turbine, and distribute the extracted steam to at least two of the following targets: feedwater pump drive, thermal storage, and heating network supply.

[0030] In the embodiments of this disclosure, based on the aforementioned determined current operating mode of the unit, the distribution path of the extracted steam from the intermediate-pressure cylinder of the turbine is adjusted through an adaptive path adjustment mechanism. This ensures that the extracted steam can be distributed as needed to at least two of the targets: feedwater pump drive, thermal storage, and heating network supply. This achieves reasonable allocation and efficient utilization of energy across different uses, providing stable energy support for subsequent heating, thermal storage, and auxiliary operation of the unit. As one implementation method, the extracted steam from the intermediate-pressure cylinder can be divided into multiple paths. One path supplies the feedwater pump turbine for its drive function, another path delivers it to related heat exchange components for thermal storage, and the third path is fed into heating network components to meet the heating network's supply requirements. The on / off state and flow rate of each distribution path can be precisely controlled through valve assemblies.

[0031] This step achieves multi-objective optimized allocation of steam extraction energy from the intermediate-pressure cylinder, avoiding energy waste under a single allocation mode. It provides suitable energy supply for unit operation mode switching, thermal storage, and heating network supply, while ensuring the stable operation of unit auxiliary equipment and improving overall energy utilization efficiency.

[0032] Step 103: When the unit enters the small volume flow operation mode, control the heat storage device to supply antifreeze heat to the indirect air-cooling system in order to maintain the antifreeze temperature of the air-cooled fan section.

[0033] In the embodiments of this disclosure, when the indirect-cooled unit (i.e., a thermal power unit using indirect air-cooling technology) switches to a small-volume flow operation mode according to the heating network load demand (in this state, only a small amount of cooling steam is introduced into the low-pressure cylinder of the unit, and it basically does not bear the power generation load), the heat storage device is activated through an adapted control mechanism, so that it outputs a preset antifreeze heat to the indirect air-cooling system. This heat can accurately supplement the heat gap of the indirect air-cooling system in the small-volume flow mode, ensuring that the working fluid temperature of the air-cooled sector is stably maintained above the antifreeze threshold, avoiding equipment damage caused by excessive cooling effect in low-temperature environments. As one implementation method, the heat storage device can be a hot water energy storage device (i.e., a heat storage tank) with temperature stratification storage function, which transports the stored high-temperature working fluid to the sector of the indirect air-cooled tower through a dedicated heat supply channel to achieve targeted replenishment of antifreeze heat.

[0034] This technology directly addresses the antifreeze challenge of indirect air-cooled systems operating under small volume flow conditions. It eliminates the need for additional cooling steam, ensuring that the air-cooled fan sections are protected from freezing and cracking damage without weakening the unit's peak-shaving capacity. This provides a core guarantee for the stable operation of the unit in low-temperature winter environments.

[0035] Step 104: Based on the status of the return water in the heating network and the heat storage status of the heat storage device, dynamically adjust the distribution path of the return water in the heating network between the heat storage device and the heating network heater to achieve coordinated control of heating and antifreeze.

[0036] In the embodiments of this disclosure, the operating status of the heat network return water (such as temperature and flow rate) and the heat storage status of the heat storage device (such as heat storage capacity and working fluid temperature) are acquired in real time. Based on the matching relationship between the two, the distribution path of the heat network return water is dynamically adjusted through an adaptive control mechanism. This allows the heat network return water to be diverted to the heat storage device or the heat network heater as needed, or distributed between the two according to a preset ratio. This ensures the coordinated matching of the heat network's heating demand with the energy storage of the heat storage device and the antifreeze requirements of the air-cooled system, achieving comprehensive control of heating stability and antifreeze reliability. As one implementation method, the heat network return water is set up in two paths: one path can be connected to the heat storage device for heat replenishment or storage, and the other path is directly connected to the heat network heater to participate in heating. The flow rate ratio of the two return water paths is adjusted through valve components to adapt to the coordinated needs under different operating scenarios.

[0037] This technology enables precise allocation and efficient utilization of the return water energy of the heating network, allowing for dynamic adaptation of heating supply, heat storage, and air-cooled antifreeze requirements. This not only ensures the stability of the heating network but also provides support for the efficient operation of the heat storage device and the antifreeze function of the air-cooled system, further enhancing the overall coordination and economy of the unit's operation.

[0038] The heat storage-based antifreeze heating method disclosed herein obtains the heating load demand of the heating network and determines the current operating mode of the unit. It adjusts the distribution of steam extracted from the intermediate pressure cylinder of the steam turbine to at least two of the following objectives: feedwater pump drive, heat storage, and heating network supply. When the unit enters a low-volume flow operation mode, it controls the heat storage device to supply antifreeze heat to the indirect air-cooled system. Furthermore, it dynamically adjusts the distribution path of the heat network return water according to the state of the heat network return water and the heat storage state of the heat storage device to achieve coordinated control of heating and antifreeze. Therefore, it can solve the problems in the prior art where insufficient cooling steam during low-volume flow operation leads to easy freezing and cracking of air-cooled fan sections, imbalance between heating network supply and demand, and difficulty in balancing peak shaving and heating. It achieves the technical effects of ensuring stable operation of the unit in low-temperature environments, improving the flexibility and reliability of heating network supply, and strengthening the unit's grid peak shaving adaptability.

[0039] As a specific implementation of this disclosure, based on the basic scheme, the determination of the current operating mode of the unit based on the demand is further defined, including: selecting the heat storage mode, the heat release peak-supplementation mode, or the small volume flow antifreeze heating mode according to the low-end period, peak period, or continuous high-load period of the heating network load; and forcibly switching to the small volume flow antifreeze heating mode when the working fluid temperature of the indirect air-cooled system is detected to be lower than the antifreeze threshold.

[0040] Specifically, the heating network load monitoring device collects real-time heating network data and, combined with preset load period division standards, determines whether the heating network load is in a low-end period, peak period, or sustained high-load period. When it is determined to be a low-end period, the heat storage mode is selected. In this case, the heating network water supply valve and the intercooler antifreeze inlet valve are closed, and the corresponding control valve of the heat storage heat exchanger is opened. Steam extracted from the intermediate-pressure cylinder of the steam turbine is preferentially introduced into the heat storage heat exchanger to heat and store the working fluid in the hot water energy storage device (i.e., the heat storage tank). When it is determined to be a peak period, the heat release peak compensation mode is selected to maintain the unit's peak load. In traditional extraction steam heating mode, the heating network supply water valve and heating network return water valve are opened, allowing the high-temperature working fluid stored in the heat storage tank to enter the heating network heater. This works in conjunction with the extraction steam from the intermediate-pressure cylinder to supply heat to the heating network, supplementing the peak load gap. When a period of sustained high load is identified, a small-volume flow anti-freeze heating mode is selected. The hydraulic butterfly valve of the connecting pipe at the outlet of the intermediate-pressure cylinder is closed, and the electric valve of the small-volume flow cooling steam bypass is opened, switching the unit to a small-volume flow operating state. Simultaneously, the indirect cooling anti-freeze inlet valve and indirect cooling anti-freeze return water valve are opened to supply the high-temperature working fluid from the heat storage tank to the indirect air-cooled system. In addition, temperature sensors are installed on the circulation pipeline of the indirect air-cooled system to monitor the working fluid temperature in the air-cooled section in real time. When the temperature is detected to be lower than the preset anti-freeze threshold (e.g., 0℃~5℃), the control system directly issues a forced switching command, immediately switching to the small-volume flow anti-freeze heating mode regardless of the current heating network load period, ensuring that the working fluid temperature in the air-cooled section quickly recovers to a safe range.

[0041] By clearly defining load periods and implementing a forced temperature switching mechanism, the system achieves precise adaptation of unit operating modes and provides a safety net against freezing. This avoids heat waste or insufficient supply under different load scenarios and can quickly respond to the freezing risks of indirect air-cooled systems, significantly improving the safety, flexibility, and reliability of unit operation.

[0042] As a specific implementation of this disclosure, based on the basic scheme, the distribution path of the steam extraction from the intermediate pressure cylinder of the steam turbine is further defined, including: dynamically controlling the steam extraction flow rate by coordinating the operation of the regulating valves set in the connecting pipeline and the cooling steam bypass; and allocating the steam extraction flow rate to the feedwater pump drive, heat storage and heat supply of the heat network according to a preset ratio based on the power demand of the feedwater pump, the remaining heat storage capacity of the heat storage device and the real-time load of the heat network.

[0043] Specifically, a hydraulic butterfly valve is installed on the connecting pipe at the outlet of the intermediate pressure cylinder of the steam turbine, and a small-volume flow rate electric valve for cooling steam bypass is installed on the cooling steam bypass. The two types of regulating valves form a coordinated control combination, which synchronously adjusts the valve opening by receiving instructions from the control system, thereby achieving dynamic and precise control of the total flow rate of steam extracted from the intermediate pressure cylinder. Simultaneously, the system collects real-time data on the operating power requirements of the feedwater pumps, the remaining thermal storage capacity of the thermal storage devices (i.e., hot water storage devices / thermal storage tanks) (including the working fluid temperature and the corresponding heat storage capacity at the liquid level), and the real-time load data of the heating network (including the demand for heat supply and water supply temperature). Based on a preset allocation ratio algorithm, the system first ensures the basic extraction steam flow required for the feedwater pumps, and then allocates the remaining extraction steam according to the matching relationship between the remaining thermal storage capacity and the heating network load: when the remaining thermal storage capacity is lower than a preset threshold (e.g., 30% of the designed heat storage capacity), the extraction steam allocation ratio to thermal storage is increased; when the real-time load of the heating network is higher than the peak threshold, the proportion of extraction steam flow to heat supply to the heating network is increased; when the demands of the three are relatively balanced, the extraction steam flow is allocated to the three targets of feedwater pump driving, thermal storage, and heating network supply according to a preset fixed ratio.

[0044] By coordinating the action of regulating valves and using multi-parameter proportional distribution logic, the steam extraction flow of the intermediate-pressure cylinder is precisely and on demand. This ensures the stable operation of the feedwater pump, efficient heat storage, and precise heating of the heating network, while avoiding the waste or imbalance of steam extraction energy. This significantly improves the unit's energy utilization efficiency and the coordinated stability of multi-objective operation.

[0045] As a specific embodiment of this disclosure, based on the basic scheme, the control of the heat storage device to supply antifreeze heat to the indirect air-cooling system is further defined, including: utilizing the temperature stratification structure within the heat storage device to preferentially extract the working fluid in the high-temperature zone and transport it to the sector of the indirect air-cooling system; and adjusting the valve opening on the antifreeze heat supply pipeline to maintain a set proportional relationship between the supplied antifreeze heat flow rate and the flow rate of cooling steam in the air-cooling sector.

[0046] Specifically, the heat storage device employs a hot water energy storage device (i.e., a heat storage tank) with temperature stratification storage function. Its interior naturally forms a high-temperature zone (upper part) and a low-temperature zone (lower part) through a temperature stratification structure. The working fluid temperature in the high-temperature zone is significantly higher than the threshold required for antifreeze, while the working fluid in the low-temperature zone is used for subsequent heat replenishment and storage. When supplying antifreeze heat to the indirect air-cooling system, this temperature stratification characteristic is utilized by setting a dedicated high-temperature working fluid heat extraction port at the top of the heat storage tank. The high-temperature working fluid from the high-temperature zone is preferentially extracted and transported to the sector of the indirect air-cooling tower through a pre-set antifreeze heat supply pipeline (one end connected to the heat extraction port, and the other end connected to the inlet of the circulating water pump of the indirect air-cooling system via the indirect air-cooling antifreeze inlet valve). Meanwhile, an opening sensor and regulating actuator are installed on the indirect cooling antifreeze inlet valve to collect real-time flow data of cooling steam in the air-cooled fan section. Based on a preset proportional algorithm (such as setting the ratio of antifreeze heat flow to cooling steam flow to 1:0.8~1:1.2), the control system dynamically adjusts the opening of the indirect cooling antifreeze inlet valve to ensure that the antifreeze heat flow and cooling steam flow supplied to the air-cooled fan section are always maintained within the set ratio range, ensuring that the antifreeze heat is accurately matched with the cooling demand. After heat exchange, the working fluid flows back to the low-temperature zone at the bottom of the heat storage tank through the bottom outlet of the indirect air-cooled tower and the indirect cooling antifreeze return valve, completing the antifreeze heat supply cycle.

[0047] By utilizing the temperature stratification structure of the heat storage device to preferentially extract high-temperature working fluid, the supply efficiency and response speed of antifreeze heat are significantly improved. Combined with valve opening adjustment to achieve the ratio matching of antifreeze heat flow and cooling steam flow, it can accurately adapt to the real-time antifreeze needs of the air-cooled fan section, which not only avoids the risk of freezing and cracking caused by insufficient heat supply, but also prevents energy waste caused by excess heat, further ensuring the safety and economy of unit operation in small volume flow mode.

[0048] As a specific implementation of this disclosure, based on the basic scheme, the distribution path of the dynamically adjusted heat network return water between the heat storage device and the heat network heater is further defined, including: comparing the temperature of the heat network return water with the temperature of the working fluid in the low-temperature zone of the heat storage device, and determining whether to directly send the return water into the heat network heater or first introduce it into the heat storage device for preheating based on the temperature difference; when the temperature of the heat network return water is lower than the set lower limit, the return water is switched to flow into the low-temperature zone of the heat storage device for heat recovery.

[0049] Specifically, a first temperature sensor is installed on the main return water pipeline of the heating network to collect the return water temperature data in real time; a second temperature sensor is installed in the lower low-temperature zone of the heat storage device (i.e., hot water energy storage device / heat storage tank) to continuously monitor the working fluid temperature in the low-temperature zone. The control system compares the data collected by the two types of temperature sensors in real time and presets a temperature difference judgment threshold (e.g., 5℃~8℃): When the temperature of the return water in the heating network is higher than the temperature of the working medium in the low-temperature zone of the heat storage tank and the temperature difference is greater than or equal to the preset threshold, it is determined that the return water does not need to be preheated. The system controls the direct-connection valve on the return water pipeline of the heating network to open and the return water valve of the heat storage tank to close, so that the return water of the heating network is directly sent to the heating network heater to participate in heat exchange and heating. When the temperature of the return water in the heating network is lower than or equal to the temperature of the working medium in the low-temperature zone of the heat storage tank, or the temperature difference is less than the preset threshold, it is determined that the return water needs to be preheated. The system switches the valve status (direct-connection valve closed, return water valve of the heat storage tank open) and introduces the return water of the heating network into the low-temperature zone of the heat storage tank. The residual heat of the working medium in the low-temperature zone of the tank is used to preheat the return water. The preheated working medium is then sent to the heating network heater through subsequent pipelines. Meanwhile, a preset lower limit for the return water temperature of the heating network (e.g., 30℃~40℃) is set. When the first temperature sensor detects that the return water temperature of the heating network is lower than this lower limit, the control system issues a forced switching command. Regardless of the current temperature difference, the system immediately controls the return water of the heating network to switch to the path flowing into the low-temperature zone of the heat storage tank. The return water temperature is then increased through heat recovery before entering the heating network heater.

[0050] By using temperature comparison and threshold control, the distribution path of the heat network return water is precisely adjusted, which not only fully recovers the waste heat in the low-temperature zone of the heat storage device, but also avoids the increase in energy consumption caused by the direct entry of low-temperature return water into the heater. While improving the heat utilization efficiency, it also ensures the heat exchange stability of the heat network heater, and further enhances the synergistic economy of heating and heat storage utilization.

[0051] As a specific embodiment of this disclosure, based on the basic scheme, the embodiment of this disclosure further includes: continuously monitoring the working fluid temperature at the outlet of the indirect air-cooling system, and increasing the flow rate of antifreeze heat supplied by the heat storage device to the indirect air-cooling system when the temperature is lower than the freezing critical temperature.

[0052] Specifically, a high-precision temperature sensor is installed on the outlet pipe of the indirect air-cooled system (i.e., the working fluid outlet pipe of the indirect air-cooled tower sector). This sensor is connected to the unit control system signal, continuously collecting real-time temperature data of the working fluid at the outlet and uploading it to the control system. The control system presets a critical freezing temperature (e.g., 0°C) for the working fluid and compares the monitored outlet working fluid temperature with this critical temperature in real time. When monitoring data shows that the working fluid temperature is below the critical freezing temperature, it indicates that there is a risk of freezing and cracking in the indirect air-cooled fan section. The control system immediately sends an adjustment command to the indirect air-cooled antifreeze inlet valve of the antifreeze heat supply pipeline between the heat storage device (i.e., hot water energy storage device / heat storage tank) and the indirect air-cooled system. The supply flow of high-temperature working fluid in the heat storage tank is increased by increasing the opening of the valve. If the temperature continues to be below the critical temperature, the valve opening can be further dynamically increased according to the preset flow increment ratio (e.g., the flow rate increases by 10%~15% for every 1°C decrease) until the monitored working fluid temperature at the outlet of the indirect air-cooled system rises back above the critical freezing temperature, and then the valve opening is stabilized at the corresponding adaptive value.

[0053] By continuously monitoring the outlet working fluid temperature of the intercooling system and controlling the threshold of the freezing critical temperature, dynamic and precise regulation of the antifreeze heat supply is achieved. This enables rapid response to the freezing risk of the air-cooled fan section, avoiding freezing and cracking damage to the fan section caused by the working fluid freezing. At the same time, the heat flow rate is adjusted as needed, ensuring the reliability of antifreeze in extreme low temperature scenarios and avoiding energy waste caused by excessive heat supply.

[0054] It should be noted that the embodiments of this disclosure may include multiple steps. For ease of description, these steps are numbered, but these numbers are not a limitation on the execution time slots or execution order between the steps; these steps can be implemented in any order, and the embodiments of this disclosure do not limit this.

[0055] Corresponding to the aforementioned heat storage antifreeze heating method, this disclosure also proposes a heat storage antifreeze heating device. Since the device embodiments of this disclosure correspond to the aforementioned method embodiments, details not disclosed in the device embodiments can be referred to the aforementioned method embodiments, and will not be repeated here.

[0056] Figure 2 This is a schematic diagram of the structure of a heat storage antifreeze heating device provided in an embodiment of this disclosure, as shown below. Figure 2 As shown, it includes: The acquisition unit 21 is used to acquire the heating load demand of the heating network and determine the current operating mode of the unit based on the demand; The adjustment unit 22 is used to adjust the distribution path of the steam extracted from the intermediate pressure cylinder of the steam turbine according to the operating mode, and distribute the extracted steam to at least two of the following targets: feedwater pump drive, thermal storage, and heating network supply. Control unit 23 is used to control the heat storage device to supply antifreeze heat to the indirect air-cooling system when the unit enters the small volume flow operation mode, so as to maintain the antifreeze temperature of the air-cooled fan section. The regulating unit 24 is used to dynamically adjust the distribution path of the heat network return water between the heat storage device and the heat network heater according to the heat network return water status and the heat storage status of the heat storage device, so as to realize the coordinated control of heating and antifreeze.

[0057] The thermal storage antifreeze heating device disclosed herein obtains the heating load demand of the heating network and determines the current operating mode of the unit. It adjusts the distribution of steam extracted from the intermediate pressure cylinder of the steam turbine to at least two of the following objectives: feedwater pump drive, thermal storage, and heating network supply. When the unit enters the low-volume flow operation mode, it controls the thermal storage device to supply antifreeze heat to the indirect air-cooling system. Furthermore, it dynamically adjusts the distribution path of the heat network return water according to the state of the heat network return water and the thermal storage state of the thermal storage device to achieve coordinated control of heating and antifreeze. Therefore, it can solve the problems in the prior art where insufficient cooling steam during low-volume flow operation leads to easy freezing and cracking of air-cooled fan sections, imbalance between heating network supply and demand, and difficulty in balancing peak shaving and heating. It achieves the technical effects of ensuring stable operation of the unit in low-temperature environments, improving the flexibility and reliability of heating network supply, and strengthening the unit's grid peak shaving adaptability.

[0058] Furthermore, in one possible implementation of this embodiment, the acquisition unit 21 is also used for: Depending on whether the heating network load is in a low-load period, a high-load period, or a period of continuous high load, the appropriate mode should be selected: heat storage mode, heat release peak-supplementation mode, or small-volume flow antifreeze heating mode. And when the working fluid temperature of the indirect air-cooled system is detected to be lower than the antifreeze threshold, it is forcibly switched to the small volume flow antifreeze heating mode.

[0059] Furthermore, in one possible implementation of this embodiment, the adjustment unit is also used for: Dynamic control of the extraction steam flow rate is achieved by coordinating the operation of regulating valves installed in the connecting pipeline and the cooling steam bypass. Based on the power requirements of the feedwater pump, the remaining heat storage capacity of the heat storage device, and the real-time load of the heating network, the steam extraction flow rate is allocated to the feedwater pump drive, heat storage, and heating network supply according to a preset ratio.

[0060] Furthermore, in one possible implementation of this embodiment, the control unit 23 is also used for: By utilizing the temperature stratification structure within the heat storage device, the working fluid in the high-temperature zone is preferentially extracted and transported to the sector of the indirect air-cooling system. By adjusting the valve opening on the antifreeze heat supply pipeline, the supplied antifreeze heat flow rate is kept in a set ratio with the flow rate of cooling steam in the air-cooled fan section.

[0061] Furthermore, in one possible implementation of this embodiment, the adjustment unit 24 is also used for: Compare the return water temperature of the heating network with the working fluid temperature in the low-temperature zone of the heat storage device, and determine whether to send the return water directly into the heating network heater or to first introduce it into the heat storage device for preheating based on the temperature difference. When the return water temperature of the heating network is lower than the set lower limit, the return water will be switched to flow into the low-temperature zone of the heat storage device for heat recovery.

[0062] Furthermore, in one possible implementation of this embodiment, such as Figure 2 As shown, it also includes: The monitoring unit 25 is used to continuously monitor the working fluid temperature at the outlet of the indirect air-cooling system, and when the temperature is lower than the freezing critical temperature, increase the flow rate of the heat storage device supplying antifreeze heat to the indirect air-cooling system.

[0063] It should be noted that the foregoing explanation of the method embodiments also applies to the apparatus of this embodiment, and the principle is the same, so it is not limited in this embodiment.

[0064] According to embodiments of this disclosure, this disclosure also provides an electronic device, a readable storage medium, and a computer program product.

[0065] Figure 3 A schematic block diagram of an example electronic device 300 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present disclosure described and / or claimed herein.

[0066] like Figure 3 As shown, the electronic device 300 includes a computing unit 301, which can perform various appropriate actions and processes based on a computer program stored in ROM (Read-Only Memory) 302 or a computer program loaded from storage unit 308 into RAM (Random Access Memory) 303. The RAM 303 may also store various programs and data required for the operation of the electronic device 300. The computing unit 301, ROM 302, and RAM 303 are interconnected via a bus 304. An I / O (Input / Output) interface 305 is also connected to the bus 304.

[0067] Multiple components in electronic device 300 are connected to I / O interface 305, including: input unit 306, such as keyboard, mouse, etc.; output unit 307, such as various types of displays, speakers, etc.; storage unit 308, such as disk, optical disk, etc.; and communication unit 309, such as network card, modem, wireless transceiver, etc. Communication unit 309 allows electronic device 300 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0068] The computing unit 301 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, CPUs (Central Processing Units), GPUs (Graphics Processing Units), various special-purpose AI (Artificial Intelligence) computing chips, various computing units running machine learning model algorithms, DSPs (Digital Signal Processors), and any suitable processor, controller, microcontroller, etc. The computing unit 301 performs the various methods and processes described above, such as the thermal storage antifreeze heating method. For example, in some embodiments, the thermal storage antifreeze heating method can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as storage unit 308. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 300 via ROM 302 and / or communication unit 309. When the computer program is loaded into RAM 303 and executed by the computing unit 301, one or more steps of the methods described above can be performed. Alternatively, in other embodiments, the computing unit 301 may be configured to perform the aforementioned heat storage antifreeze heating method by any other suitable means (e.g., by means of firmware).

[0069] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, FPGAs (Field Programmable Gate Arrays), ASICs (Application-Specific Integrated Circuits), ASSPs (Application-Specific Standard Products), SOCs (System-on-Chips), CPLDs (Complex Programmable Logic Devices), computer hardware, firmware, software, and / or combinations thereof. These various implementations may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0070] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0071] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, RAM, ROM, EPROM (Electrically Programmable Read-Only Memory) or flash memory, optical fiber, CD-ROM (Compact Disc Read-Only Memory), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0072] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (Cathode-Ray Tube) or LCD (Liquid Crystal Display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0073] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include LANs (Local Area Networks), WANs (Wide Area Networks), the Internet, and blockchain networks.

[0074] Computer systems can include clients and servers. Clients and servers are generally geographically separated and typically interact via communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. A server can be a cloud server, also known as a cloud computing server or cloud host, a hosting product within the cloud computing service system that addresses the shortcomings of traditional physical hosts and VPS (Virtual Private Server) services, such as high management difficulty and weak business scalability. Servers can also be servers for distributed systems or servers incorporating blockchain technology.

[0075] It's important to note that artificial intelligence (AI) is the study of enabling computers to simulate certain human thought processes and intelligent behaviors (such as learning, reasoning, thinking, and planning). It encompasses both hardware and software technologies. AI hardware technologies generally include sensors, dedicated AI chips, cloud computing, distributed storage, and big data processing. AI software technologies primarily include computer vision, speech recognition, natural language processing, machine learning / deep learning, big data processing, and knowledge graph technologies.

[0076] The various numerical designations such as "first," "second," etc., used in this disclosure are merely for ease of description and are not intended to limit the scope of the embodiments of this disclosure, nor do they indicate a sequential order.

[0077] At least one of the features described in this disclosure can also be described as one or more, and multiple features can be two, three, four or more, and this disclosure does not impose any limitations. In the embodiments of this disclosure, for a technical feature, the technical features in that technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", etc., and there is no sequential order or size order among the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0078] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0079] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A heat storage-type antifreeze heating method, characterized in that, include: Obtain the heating load demand of the heating network, and determine the current operating mode of the unit based on the demand; According to the operating mode, the distribution path of the extracted steam from the intermediate pressure cylinder of the steam turbine is adjusted to distribute the extracted steam to at least two of the following targets: feedwater pump drive, thermal storage, and heating network supply. When the unit enters the small volume flow operation mode, the control heat storage device supplies antifreeze heat to the indirect air-cooling system to maintain the antifreeze temperature of the air-cooled fan section. Based on the status of the return water in the heating network and the heat storage status of the heat storage device, the distribution path of the return water in the heating network between the heat storage device and the heating network heater is dynamically adjusted to achieve coordinated control of heating and antifreeze.

2. The method according to claim 1, characterized in that, Determining the current operating mode of the unit based on the aforementioned requirements includes: Depending on whether the heating network load is in a low-load period, a high-load period, or a period of continuous high load, the appropriate mode should be selected: heat storage mode, heat release peak-supplementation mode, or small-volume flow antifreeze heating mode. And when the working fluid temperature of the indirect air-cooled system is detected to be lower than the antifreeze threshold, it is forcibly switched to the small volume flow antifreeze heating mode.

3. The method according to claim 1, characterized in that, The adjustment of the distribution path of the extraction steam from the intermediate pressure cylinder of the steam turbine includes: Dynamic control of the extraction steam flow rate is achieved by coordinating the operation of regulating valves installed in the connecting pipeline and the cooling steam bypass. Based on the power requirements of the feedwater pump, the remaining heat storage capacity of the heat storage device, and the real-time load of the heating network, the steam extraction flow rate is allocated to the feedwater pump drive, heat storage, and heating network supply according to a preset ratio.

4. The method according to claim 1, characterized in that, The controlled heat storage device supplies antifreeze heat to the indirect air-cooling system, including: By utilizing the temperature stratification structure within the heat storage device, the working fluid in the high-temperature zone is preferentially extracted and transported to the sector of the indirect air-cooling system. By adjusting the valve opening on the antifreeze heat supply pipeline, the supplied antifreeze heat flow rate is kept in a set ratio with the flow rate of cooling steam in the air-cooled fan section.

5. The method according to claim 1, characterized in that, The dynamic adjustment of the distribution path of the return water from the heating network between the heat storage device and the heating network heater includes: Compare the return water temperature of the heating network with the working fluid temperature in the low-temperature zone of the heat storage device, and determine whether to send the return water directly into the heating network heater or to first introduce it into the heat storage device for preheating based on the temperature difference. When the return water temperature of the heating network is lower than the set lower limit, the return water will be switched to flow into the low-temperature zone of the heat storage device for heat recovery.

6. The method according to claim 1, characterized in that, Also includes: Continuously monitor the working fluid temperature at the outlet of the indirect air-cooling system, and when this temperature is lower than the freezing critical temperature, increase the flow rate of antifreeze heat supplied by the heat storage device to the indirect air-cooling system.

7. A heat storage antifreeze heating device, characterized in that, include: The acquisition unit is used to acquire the heating load demand of the heating network and determine the current operating mode of the unit based on the demand; The adjustment unit is used to adjust the distribution path of the steam extracted from the intermediate pressure cylinder of the steam turbine according to the operating mode, and distribute the extracted steam to at least two of the following targets: feedwater pump drive, thermal storage, and heating network supply. The control unit is used to control the heat storage device to supply antifreeze heat to the indirect air-cooling system when the unit enters the small volume flow operation mode, so as to maintain the antifreeze temperature of the air-cooled fan section. The regulating unit is used to dynamically adjust the distribution path of the heat network return water between the heat storage device and the heat network heater according to the heat network return water status and the heat storage status of the heat storage device, so as to realize the coordinated control of heating and antifreeze.

8. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.

9. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-6.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method according to any one of claims 1-6.

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