Condensate peak and frequency regulation method and system based on heat storage system

Abstract

The invention discloses a condensation water peak regulation and frequency modulation method and system based on a heat storage system, relates to the technical field of condensation water peak regulation and frequency modulation, and is applied to peak regulation and frequency modulation equipment, and the peak regulation and frequency modulation equipment comprises a boiler, a steam turbine, a condenser, a deaerator, a low-pressure heater and a heat storage assembly which are mutually connected through pipelines; the peak and frequency regulation method comprises the steps that the water level of the condenser is obtained, and heat storage working condition variable load regulation or heat release working condition variable load regulation is selected according to the difference value of the actual water level and the standard water level of the condenser and the size of condensed water flow. By adjusting the condensate pump control valve, the high-temperature condensate in the heat storage tank and the cold end flow, the change of the power grid load can be quickly responded, and the loading or unloading operation of the unit is realized; by reasonably utilizing the high-temperature working medium and the low-temperature working medium in the heat storage tank, the heat efficiency of the system can be effectively improved, energy waste is reduced, and redundant heat can be stored in the heat storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of condensate water peak-shaving and frequency-modulation, and in particular to a condensate water peak-shaving and frequency-modulation method and system based on a heat storage system. Background Art

[0002] In the power system, grid load fluctuation is a common phenomenon. In order to ensure the stable operation of the power grid, power plants usually need to flexibly adjust the load of the generator sets. However, there are some problems with the traditional load adjustment method:

[0003] 1. Slow response speed: Traditional methods usually change the unit load by adjusting fuel supply or steam flow, but this method has a slow response speed and is difficult to quickly respond to drastic fluctuations in grid load;

[0004] 2. Poor system stability: When the load changes rapidly, the system's thermal balance and water level control are difficult to maintain stability, which can easily cause system fluctuations and affect the safe operation of the generator set;

[0005] 3. Low energy efficiency: Since traditional methods mainly rely on adjustments during the fuel combustion process, energy utilization efficiency is low, which easily leads to energy waste. Summary of the invention

[0006] In view of the existing condensate water peak-shaving and frequency-regulating system based on the heat storage system and the problems existing in the system, the present invention is proposed.

[0007] Therefore, the problems to be solved by the present invention are: slow response speed, poor system stability, and low energy efficiency.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] In a first aspect, an embodiment of the present invention provides a condensate peak-shaving and frequency-regulating method based on a heat storage system, which is applied to a peak-shaving and frequency-regulating device, wherein the peak-shaving and frequency-regulating device includes a boiler, a steam turbine, a condenser, a deaerator, a low-pressure heater, and a heat storage component interconnected by pipelines;

[0010] The peak-shaving and frequency-regulating method includes obtaining the water level of the condenser, and selecting to use the variable load regulation of the heat storage condition or the variable load regulation of the heat release condition according to the difference between the actual water level of the condenser and the standard water level and the size of the condensate flow rate.

[0011] As a preferred solution of the condensate peak-shaving and frequency-regulating method based on the heat storage system of the present invention, wherein: the heat storage component includes a heat storage tank, and an axial fan connected to the heat storage tank;

[0012] Wherein, the two ends of the heat storage tank are respectively a hot end tank and a cold end tank.

[0013] As a preferred solution of the condensate water peak-shaving and frequency-modulating method based on the heat storage system of the present invention, the judgment condition for using the heat storage component to store heat is:

[0014] Get the current grid load and determine whether the current grid load is less than the standard load. If the result is not less than the standard load, do not use the heat storage component for heat storage. If the result is less than the standard load, introduce a timestamp to get the current time point, set the number of days to be determined N days, query the grid load at that time point within N days, and determine whether the current grid load is the same as the grid load at that time point within N days:

[0015] Set the fluctuation range to K. When the difference between the current grid load and the grid load at that time within N days is less than the fluctuation range K, the result is judged to be the same. When the difference between the current grid load and the grid load at that time within N days is not less than the fluctuation range K, the result is judged to be different.

[0016] When the judgment result is different, the heat storage component is not used to store heat;

[0017] When the judgment result is the same, the fluctuation of the power grid load within N days is obtained. When the fluctuation value is greater than the fluctuation range K, the time point is extracted, and the difference between the two time points is calculated to obtain the average time range, and the heat storage component is used to store heat within the average time range;

[0018] The calculation formula for obtaining the average time range is:

[0019]

[0020] In the formula, S 平均 Expressed as the average time range, S N It is expressed as the difference between two time points on day N, and α is the protection value, which is 0 or 1.

[0021] As a preferred solution of the condensate peak-shaving and frequency-regulating method based on the heat storage system of the present invention, wherein: the variable load regulation of the heat storage working condition includes adding load under the heat storage working condition and reducing load under the heat storage working condition;

[0022] The method for using the thermal storage condition load-adding method includes:

[0023] Reduce the condensate pump valve, reduce the condensate flow, reduce the condensate flow entering the deaerator, and reduce the water level in the deaerator;

[0024] After reducing the exhaust volume of the low-pressure heater, the steam is no longer used to heat the condensate, but the steam volume of the generator set is increased to increase the load;

[0025] By reducing the amount of hot water flowing from the low-pressure heater to the heat storage tank, and at the same time reducing the flow of low-temperature water in the heat storage tank to the condenser, it is used to maintain the working medium balance of the heat storage tank and the stability of the condenser water level;

[0026] The method for using the heat storage condition load reduction comprises:

[0027] Enlarging the condensate pump valve to increase the condensate flow rate will increase the condensate flow rate entering the deaerator, causing the water level in the deaerator to rise.

[0028] By increasing the exhaust volume of the low-pressure heater, more steam will be used to heat condensate, while the steam volume of the generator set will be reduced, thus reducing the load.

[0029] By increasing the amount of hot water flowing from the low-pressure heater to the heat storage tank and at the same time increasing the flow of low-temperature water in the heat storage tank to the condenser, the working fluid balance of the heat storage tank and the stability of the condenser water level are maintained.

[0030] As a preferred solution of the condensate peak-shaving and frequency-modulating method based on the heat storage system of the present invention, the judgment condition for using the heat storage component to release heat is:

[0031] Get the current grid load and determine whether the current grid load is less than the standard load. If the result is less than the standard load, the heat storage component is not used for heat release. If the result is not less than the standard load, a timestamp is introduced to obtain the current time point. Set the number of days to be determined N days, query the grid load at that time point within N days, and determine whether the current grid load is the same as the grid load at that time point within N days:

[0032] Set the fluctuation range to K. When the difference between the current grid load and the grid load at that time within N days is less than the fluctuation range K, the result is judged to be the same. When the difference between the current grid load and the grid load at that time within N days is not less than the fluctuation range K, the result is judged to be different.

[0033] When the judgment result is not the same, the heat storage component is not used to release heat;

[0034] When the judgment result is the same, the fluctuation of the power grid load within N days is obtained. When the fluctuation value is greater than the fluctuation range K, the time point is extracted, and the difference between the two time points is calculated to obtain the average time range, and the heat storage component is used to release heat within the average time range.

[0035] As a preferred solution of the condensate peak-shaving and frequency-regulating method based on the heat storage system described in the present invention, wherein: the variable load regulation under the heat release condition includes adding load under the heat release condition and reducing load under the heat release condition;

[0036] The method for using the heat release condition load-adding method includes:

[0037] Reduce the condensate pump adjustment, reduce the condensate flow, reduce the exhaust volume of the low-pressure heater, increase the steam volume of the steam generator set, and increase the load;

[0038] Increase the amount of hot water sent from the high-temperature condensate in the heat storage tank to the deaerator, and increase the flow from the shaft fan to the cold end of the heat storage tank.

[0039] As a preferred solution of the condensate peak-shaving and frequency-regulating method based on the heat storage system of the present invention, the method of using the heat release condition to reduce the load includes:

[0040] The condensate pump valve is enlarged to increase the condensate flow rate, the air extraction of the low-pressure heater is increased, and the steam is used to heat the condensate to reduce the load;

[0041] Reduce the amount of hot water sent to the deaerator from the high-temperature condensate in the heat storage tank, and reduce the flow from the shaft fan to the cold end of the heat storage tank.

[0042] In a second aspect, an embodiment of the present invention provides a condensate peak-shaving and frequency-regulating system based on a heat storage system, which is applied to a peak-shaving and frequency-regulating device, wherein the peak-shaving and frequency-regulating device includes a boiler, a steam turbine, a condenser, a deaerator, a low-pressure heater, and a heat storage component interconnected by pipelines;

[0043] The peak load and frequency modulation system includes a judgment module, a heat storage control module, and a heat release control module;

[0044] The judgment module is used to judge the current grid load and the standard load, and select different measures according to the judgment result;

[0045] The heat storage control module starts the heat storage operation according to the instruction of the judgment module when the grid load is lower than the standard load, and stores the excess heat energy in the heat storage tank;

[0046] The heat release control module starts the heat release operation and releases the heat energy in the heat storage tank according to the instruction of the judgment module when the grid load is higher than the standard load.

[0047] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, any step of the above-mentioned condensate water peak and frequency regulation method based on the heat storage system is implemented.

[0048] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned condensate water peak-shaving and frequency-regulating method based on a heat storage system is implemented.

[0049] The beneficial effects of the present invention are as follows: by adjusting the condensate pump valve, the high-temperature condensate in the heat storage tank and the cold end flow, it is possible to quickly respond to changes in the load of the power grid, realize load increase or load reduction operation of the unit, and ensure the stable operation of the power grid;

[0050] By rationally utilizing the high-temperature and low-temperature working fluids in the heat storage tank, the thermal efficiency of the system can be effectively improved, energy waste can be reduced, and excess heat can be stored in the heat storage tank;

[0051] By precisely controlling the water level in the heat storage tank and condenser, the thermal balance and water level stability of the system are ensured, avoiding system fluctuations caused by load changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0053] Figure 1 This is a structural diagram of the condensate peak-shaving and frequency-regulating method based on the heat storage system.

[0054] Figure 2 This is a flow chart of the heat storage operating conditions of the condensate water peak-shaving and frequency-regulating method based on the heat storage system.

[0055] Figure 3 This is a flow chart of the heat release condition of the condensate peak-shaving and frequency-regulating method based on the heat storage system. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0058] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0059] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0060] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Example 1

[0063] Reference Figure 1 to Figure 3 , which is the first embodiment of the present invention, and provides a condensate peak-shaving and frequency-regulating method based on a heat storage system, which is applied to a peak-shaving and frequency-regulating device, wherein the peak-shaving and frequency-regulating device includes a boiler 1, a steam turbine 2, a condenser 3, a deaerator 4, a low-pressure heater 5, and a heat storage component interconnected by pipelines;

[0064] The heat storage assembly includes a heat storage tank 6 and an axial fan 7 connected to the heat storage tank 6;

[0065] Wherein, the two ends of the heat storage tank 6 are respectively a hot end tank and a cold end tank.

[0066] The peak-shaving and frequency-regulating method includes obtaining the water level of the condenser 3, and selecting to use the variable load regulation of the heat storage condition or the variable load regulation of the heat release condition according to the difference between the actual water level of the condenser 3 and the standard water level and the size of the condensate flow rate.

[0067] The judgment condition for using the heat storage component to store heat is:

[0068] Get the current grid load and determine whether the current grid load is less than the standard load. If the result is not less than the standard load, do not use the heat storage component for heat storage. If the result is less than the standard load, introduce a timestamp to obtain the current time point, set the number of days to be determined N days, query the grid load at that time point within N days, and determine whether the current grid load is the same as the grid load at that time point within N days:

[0069] For example, when the judgment result is less than the standard load, the current time point is 0:30, and the judgment days are set to 3 days, then the grid load situation at the time point 0:30 within 3 days is queried, and it is judged whether the grid load situation at that time in the past 3 days is the same as the grid load situation at the current time;

[0070] Set the fluctuation range to K. When the difference between the current grid load and the grid load at that time within N days is less than the fluctuation range K, the result is judged to be the same. When the difference between the current grid load and the grid load at that time within N days is not less than the fluctuation range K, the result is judged to be different.

[0071] For example, if the fluctuation range is set to 5% of the load, if the fluctuation range of the grid load at the current time is less than 5% with the grid load at 0:30 within 3 days, the output judgment result is the same, otherwise it is different;

[0072] When the judgment result is different, the heat storage component is not used to store heat;

[0073] When the judgment result is the same, the fluctuation of the power grid load within N days is obtained. When the fluctuation value is greater than the fluctuation range K, the time point is extracted, and the difference between the two time points is calculated to obtain the average time range, and the heat storage component is used to store heat within the average time range;

[0074] The calculation formula for obtaining the average time range is:

[0075]

[0076] In the formula, S 平均 Expressed as the average time range, S N It is expressed as the difference between two time points on day N, and α is the protection value, which is 0 or 1;

[0077] During the calculation, the fluctuation of the power grid load within 3 days is obtained. When the time point is 6:00, the fluctuation value is greater than the fluctuation range of 5%, then the time period is output, that is, 0:30-6:00, that is, 330 minutes, that is, the value of S1 in the calculation formula. In the same way, the difference of the second day is obtained, that is, the value of S2 and the value of S3. Among them, the protection value is that when an abnormality occurs, the output is 0, that is, the calculation is canceled. During normal operation, the output is 1.

[0078] The variable load regulation of the heat storage working condition includes adding load under the heat storage working condition and reducing load under the heat storage working condition;

[0079] The method for using the thermal storage condition load-adding method includes:

[0080] Reduce the condensate pump valve, reduce the condensate flow, reduce the condensate flow entering the deaerator 4, and reduce the water level in the deaerator 4;

[0081] Reducing the condensate flow rate will directly affect the water level and pressure of the deaerator 4. By adjusting the steam extraction amount of the low-pressure heater 5, the balance and stability of the system can be maintained;

[0082] After reducing the exhaust volume of the low-pressure heater 5, the steam is no longer used to heat the condensate, but the steam volume of the generator set is increased to increase the load;

[0083] By reducing the amount of steam extraction for the low-pressure heater 5, more steam can be directly used for power generation, thereby increasing the power generation load of the unit;

[0084] By reducing the amount of hot water flowing from the low-pressure heater 5 to the heat storage tank 6, and at the same time reducing the flow of low-temperature water in the heat storage tank 6 to the condenser 3, the working medium balance of the heat storage tank 6 and the stability of the water level of the condenser 3 are maintained;

[0085] The method for using the heat storage condition load reduction comprises:

[0086] Enlarging the condensate pump valve to increase the condensate flow rate, increasing the condensate flow rate entering the deaerator 4, and causing the water level in the deaerator 4 to rise;

[0087] Increasing the condensate flow rate will directly lead to the need for more extraction steam to heat the condensate, resulting in a reduction in the steam available to drive the steam turbine 2 to generate electricity;

[0088] After increasing the exhaust volume of the low-pressure heater 5, more steam will be used to heat the condensate, while the steam volume of the generator set will be reduced, thus reducing the load;

[0089] By increasing the amount of hot water flowing from the low-pressure heater 5 to the heat storage tank 6 and at the same time increasing the flow of low-temperature water in the heat storage tank 6 to the condenser 3, the working medium balance of the heat storage tank 6 and the stability of the water level of the condenser 3 are maintained.

[0090] The judgment condition for using the heat storage component to release heat is:

[0091] Get the current grid load and determine whether the current grid load is less than the standard load. If the result is less than the standard load, the heat storage component is not used for heat release. If the result is not less than the standard load, a timestamp is introduced to obtain the current time point. Set the number of days for determination N days, query the grid load at that time point within N days, and determine whether the current grid load is the same as the grid load at that time point within N days:

[0092] Set the fluctuation range to K. When the difference between the current grid load and the grid load at that time within N days is less than the fluctuation range K, the result is judged to be the same. When the difference between the current grid load and the grid load at that time within N days is not less than the fluctuation range K, the result is judged to be different.

[0093] When the judgment result is not the same, the heat storage component is not used to release heat;

[0094] When the judgment result is the same, the fluctuation of the power grid load within N days is obtained. When the fluctuation value is greater than the fluctuation range K, the time point is extracted, and the difference between the two time points is calculated to obtain the average time range, and the heat storage component is used to release heat within the average time range;

[0095] The judgment conditions for using the heat storage component to release heat are the same as the judgment conditions for using the heat storage component to store heat.

[0096] Variable load regulation under heat release condition includes load increase under heat release condition and load reduction under heat release condition;

[0097] The method for using the heat release condition load-adding method includes:

[0098] Reduce the condensate pump adjustment valve, reduce the condensate flow, reduce the exhaust volume of the low-pressure heater 5, increase the steam volume of the steam generator set, and increase the load;

[0099] Increase the amount of hot water sent from the high-temperature condensed water in the heat storage tank 6 to the deaerator 4, and increase the flow from the shaft fan 7 to the cold end of the heat storage tank 6.

[0100] The method for using the heat release condition load reduction includes:

[0101] The condensate pump valve is enlarged to increase the condensate flow rate, the air extraction amount of the low-pressure heater 5 is increased, and the steam is used to heat the condensate to reduce the load;

[0102] Reduce the amount of hot water sent from the high-temperature condensed water in the heat storage tank 6 to the deaerator 4, and reduce the flow from the shaft fan 7 to the cold end of the heat storage tank 6.

[0103] In summary, by adjusting the condensate pump valve, the high-temperature condensate in the heat storage tank 6 and the cold end flow, it is possible to quickly respond to changes in the grid load, realize load increase or load reduction operation of the unit, and ensure stable operation of the grid; by rationally utilizing the high-temperature and low-temperature working fluids in the heat storage tank 6, it is possible to effectively improve the thermal efficiency of the system, reduce energy waste, and store excess heat in the heat storage tank 6; by accurately controlling the water levels of the heat storage tank 6 and the condenser 3, the thermal balance and water level stability of the system are ensured, avoiding system fluctuations caused by load changes.

[0104] Example 2

[0105] On the basis of the first embodiment, this embodiment further provides a condensate peak-shaving and frequency-regulating system based on a heat storage system, which is applied to a peak-shaving and frequency-regulating device, wherein the peak-shaving and frequency-regulating device includes a boiler 1, a steam turbine 2, a condenser 3, a deaerator 4, a low-pressure heater 5, and a heat storage component interconnected by pipelines;

[0106] The peak load and frequency regulation system includes a judgment module, a heat storage control module, and a heat release control module;

[0107] The judgment module is used to judge the current grid load and the standard load, and select different measures according to the judgment result;

[0108] The heat storage control module starts the heat storage operation according to the instruction of the judgment module when the grid load is lower than the standard load, and stores the excess heat energy in the heat storage tank;

[0109] The heat release control module starts the heat release operation and releases the heat energy in the heat storage tank according to the instruction of the judgment module when the grid load is higher than the standard load.

[0110] This embodiment also provides a computer device, which is suitable for the condensate water peak-shaving and frequency-regulating method based on a heat storage system, and includes a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the condensate water peak-shaving and frequency-regulating method based on a heat storage system as proposed in the above embodiment.

[0111] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0112] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for implementing condensate water peak-shaving and frequency modulation based on a heat storage system as proposed in the above embodiment is implemented.

[0113] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0114] Example 3

[0115] On the basis of the previous two embodiments, this embodiment provides a condensate water peak-shaving and frequency-regulating method based on a heat storage system. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0116] 1. Frequency modulation capability calculation

[0117] For a 350MW generator set, the condensate flow rate is about 900t / h under rated load conditions. According to the extraction volume of the low-pressure heater and the extraction enthalpy drop, the theoretical increase in the unit load when all the extraction of the low-pressure heater is cut off is about 5% of the rated load (i.e., about 18.55MW), which is also the limit of the condensate throttling, peak-shaving and frequency regulation capabilities.

[0118] The unit needs to take into account the energy storage and peak load regulation of the heat storage tank as well as the ability of condensate to participate in load regulation under all operating conditions. The condensate throttling, peak load regulation and frequency regulation capacity is calculated to be around 15MW.

[0119] 2. Calculation of comprehensive variable load performance indicators

[0120] According to the calculation of the peak-shaving and frequency-regulating capabilities of condensate throttling, the unit can achieve rapid load regulation through condensate throttling control in the initial stage of load change, and the initial regulation rate can reach 5MW / min; after the unit coordinated control system is optimized, the unit's rapid load change performance is improved, and the load regulation rate can be guaranteed to be above 6MW / min.

[0121] In summary, the load can be adjusted quickly through condensate throttling control, with the initial (first minute) adjustment rate reaching more than 11MW / min and the 5-minute adjustment rate reaching more than 35MW.

[0122] 3. Economic indicators

[0123] After adding heat storage components to the condensate system, when the furnace side reaches the minimum stable combustion load, by storing heat in the heat storage components, the unit power output can be further reduced by about 5% for a period of time (8-16 hours), increasing the minimum output deep peak regulation benefits, and temporarily calling the clearing electricity price of 1,000 yuan according to the 30% load of the power grid.

[0124] / MWh calculation, theoretically, the revenue can be increased by 350*5%=17,500 yuan / h on the basis of the existing peak-shaving capacity, and the deep peak-shaving capacity of 25%Pe can increase the competitiveness of the unit in the grid peak-shaving market to a certain extent.

[0125] During high-load periods, especially when burning low-quality coal, heat is released through the heat storage components, which increases the unit's load capacity by 5% while maintaining the boiler output, thereby ensuring the grid's dispatching load requirements.

[0126] Through the thermoelectric coupling characteristics of the heat storage component, the operation mode of the coal mill is optimized to achieve that during low-load periods, the boiler carries a load that is about 5% higher than the machine side, so that the coal mill maintains a relatively high working efficiency and the excess energy enters the heat storage component. During high-load periods, when the operation of the three mills cannot meet the demand, the heat storage component is used to release heat, and the machine side can carry about 5% more load than the boiler side.

[0127] The unit's ability to participate in the auxiliary frequency regulation market is further improved. By adjusting the condensate flow, the unit can achieve rapid frequency regulation, improve the unit's climbing ability, and ensure safe and stable operation of the unit, increasing the auxiliary frequency regulation benefits. After the regulation rate increases, the unit's AGC progress is improved, and then the Kp value is improved. After the Kp value is improved, the unit's ability to participate in auxiliary frequency regulation is improved, which can further increase the frequency regulation mileage and quotation, and increase the frequency regulation service fee by more than 2 times.

[0128] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A condensate water peak-shaving and frequency-modulating method based on a heat storage system, characterized in that: Applied to peak-shaving and frequency-regulating equipment, the peak-shaving and frequency-regulating equipment includes a boiler, a steam turbine, a condenser, a deaerator, a low-pressure heater, and a heat storage component interconnected by pipelines; The peak-shaving and frequency-regulating method includes obtaining the water level of the condenser, and selecting to use the variable load regulation of the heat storage condition or the variable load regulation of the heat release condition according to the difference between the actual water level of the condenser and the standard water level and the size of the condensate flow rate.

2. The condensate peak-shaving and frequency-modulating method based on the heat storage system according to claim 1, characterized in that: The heat storage assembly includes a heat storage tank and a shaft-added fan connected to the heat storage tank; Wherein, the two ends of the heat storage tank are respectively a hot end tank and a cold end tank.

3. The condensate peak-shaving and frequency-modulating method based on the heat storage system according to claim 2, characterized in that: The judgment condition for using the heat storage component to store heat is: Get the current grid load and determine whether the current grid load is less than the standard load. If the result is not less than the standard load, do not use the heat storage component for heat storage. If the result is less than the standard load, introduce a timestamp to get the current time point, set the number of days to be determined N days, query the grid load at that time point within N days, and determine whether the current grid load is the same as the grid load at that time point within N days: Set the fluctuation range to K. When the difference between the current grid load and the grid load at that time within N days is less than the fluctuation range K, the result is judged to be the same. When the difference between the current grid load and the grid load at that time within N days is not less than the fluctuation range K, the result is judged to be different. When the judgment result is different, the heat storage component is not used to store heat; When the judgment result is the same, the fluctuation of the power grid load within N days is obtained. When the fluctuation value is greater than the fluctuation range K, the time point is extracted, and the difference between the two time points is calculated to obtain the average time range, and the heat storage component is used to store heat within the average time range; The calculation formula for obtaining the average time range is: In the formula, S 平均 Expressed as the average time range, S N It is expressed as the difference between two time points on day N, and α is the protection value, which is 0 or 1.

4. The condensate peak-shaving and frequency-modulating method based on the heat storage system according to claim 3, characterized in that: The variable load regulation of the heat storage working condition includes adding load under the heat storage working condition and reducing load under the heat storage working condition; The method for using the thermal storage condition load-adding method includes: Reduce the condensate pump valve, reduce the condensate flow, reduce the condensate flow entering the deaerator, and reduce the water level in the deaerator; After reducing the exhaust volume of the low-pressure heater, the steam is no longer used to heat the condensate, but the steam volume of the generator set is increased to increase the load; By reducing the amount of hot water flowing from the low-pressure heater to the heat storage tank, and at the same time reducing the flow of low-temperature water in the heat storage tank to the condenser, it is used to maintain the working medium balance of the heat storage tank and the stability of the condenser water level; The method for using the heat storage condition load reduction comprises: Enlarging the condensate pump valve to increase the condensate flow rate will increase the condensate flow rate entering the deaerator, causing the water level in the deaerator to rise. By increasing the exhaust volume of the low-pressure heater, more steam will be used to heat condensate, while the steam volume of the generator set will be reduced, thus reducing the load. By increasing the amount of hot water flowing from the low-pressure heater to the heat storage tank and at the same time increasing the flow of low-temperature water in the heat storage tank to the condenser, the working fluid balance of the heat storage tank and the stability of the condenser water level are maintained.

5. The condensate peak-shaving and frequency-modulating method based on a heat storage system according to claim 2 or 4, characterized in that: The judgment condition for using the heat storage component to release heat is: Get the current grid load and determine whether the current grid load is less than the standard load. If the result is less than the standard load, the heat storage component is not used for heat release. If the result is not less than the standard load, a timestamp is introduced to obtain the current time point. Set the number of days to be determined N days, query the grid load at that time point within N days, and determine whether the current grid load is the same as the grid load at that time point within N days: Set the fluctuation range to K. When the difference between the current grid load and the grid load at that time within N days is less than the fluctuation range K, the result is judged to be the same. When the difference between the current grid load and the grid load at that time within N days is not less than the fluctuation range K, the result is judged to be different. When the judgment result is not the same, the heat storage component is not used to release heat; When the judgment result is the same, the fluctuation of the power grid load within N days is obtained. When the fluctuation value is greater than the fluctuation range K, the time point is extracted, and the difference between the two time points is calculated to obtain the average time range, and the heat storage component is used to release heat within the average time range.

6. The condensate peak-shaving and frequency-modulating method based on the heat storage system according to claim 5, characterized in that: Variable load regulation under heat release condition includes load increase under heat release condition and load reduction under heat release condition; The method for using the heat release condition load-adding method includes: Reduce the condensate pump adjustment, reduce the condensate flow, reduce the exhaust volume of the low-pressure heater, increase the steam volume of the steam generator set, and increase the load; Increase the amount of hot water sent from the high-temperature condensate in the heat storage tank to the deaerator, and increase the flow from the shaft fan to the cold end of the heat storage tank.

7. The condensate peak-shaving and frequency-modulating method based on the heat storage system according to claim 6, characterized in that: The method for using the heat release condition load reduction includes: The condensate pump valve is enlarged to increase the condensate flow rate, the air extraction of the low-pressure heater is increased, and the steam is used to heat the condensate to reduce the load; Reduce the amount of hot water sent to the deaerator from the high-temperature condensate in the heat storage tank, and reduce the flow from the shaft fan to the cold end of the heat storage tank.

8. A condensate water peak-shaving and frequency-modulating system based on a heat storage system, based on the condensate water peak-shaving and frequency-modulating method based on a heat storage system according to any one of claims 1 to 7, characterized in that: Applied to peak-shaving and frequency-regulating equipment, the peak-shaving and frequency-regulating equipment includes a boiler, a steam turbine, a condenser, a deaerator, a low-pressure heater, and a heat storage component interconnected by pipelines; The peak load and frequency modulation system includes a judgment module, a heat storage control module, and a heat release control module; The judgment module is used to judge the current grid load and the standard load, and select different measures according to the judgment result; The heat storage control module starts the heat storage operation according to the instruction of the judgment module when the grid load is lower than the standard load, and stores the excess heat energy in the heat storage tank; The heat release control module starts the heat release operation and releases the heat energy in the heat storage tank according to the instruction of the judgment module when the grid load is higher than the standard load.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the condensate water peak-shaving and frequency-regulating method based on the heat storage system according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the condensate water peak-shaving and frequency-regulating method based on a heat storage system according to any one of claims 1 to 7 are implemented.

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