Fan energy-saving optimization method and system based on deep peak regulation of thermal power generating unit

Abstract

The invention relates to a fan energy-saving optimization method and system based on deep peak regulation of a thermal power generating unit, and the method comprises the following steps: collecting historical data of two induced draft fans of a dual-series flue gas and air system during operation, including load data, induced draft fan air volume data and induced draft fan power data; according to the collected historical data, a fitting formula of the total power of the two induced draft fans and the unit load, a fitting formula of the total air volume of the two induced draft fans and the unit load and a fitting formula of the power of a single induced draft fan and the air volume of the single induced draft fan are obtained; according to a fitting formula of the total air volume of the two induced draft fans and the unit load and a fitting formula of the power of the single induced draft fan and the air volume of the single induced draft fan, power and load calculated values of the single induced draft fan are obtained; verifying power and load calculation values of the single induced draft fan through operation experiment data of the single induced draft fan; and according to the fitting formula of the total power of the two induced draft fans and the unit load and the power and load calculation value of the single induced draft fan, the energy-saving operation interval of the single induced draft fan and the energy-saving operation interval of the two induced draft fans are determined.

Description

Technical Field

[0001] The present application relates to the technical field of power system optimization and dispatching, and more specifically, to a method and system for optimizing fan energy saving based on deep peak regulation of thermal power units. Background Art

[0002] In the operation of thermal power units, deep peak load regulation has become a common operation. However, this process faces many challenges. As the peak load regulation depth increases, the unit load changes frequently and with large amplitudes, and the smoke and wind system operating conditions are complex and changeable. Traditional fan operation methods are difficult to adapt to such changes, often resulting in excessive energy consumption. For example, under partial load conditions, the fan may deviate from the efficient operation range, resulting in a large amount of energy waste.

[0003] At the same time, existing energy-saving technologies have shortcomings. Although some methods take some factors into consideration, they fail to fully take into account the complex relationship between fan power, air volume and unit load. For example, some technologies only focus on a single device or specific working conditions, lacking a systematic energy-saving optimization strategy.

[0004] In addition, in terms of fan operation management, there is a lack of accurate methods for determining the operating range, which makes it difficult for operators to determine whether it is more energy-efficient to use a single or two fans under different loads, and it is impossible to achieve refined energy consumption control.

[0005] In summary, under the background of deep peak regulation of thermal power units, there is an urgent need for a method and system that can comprehensively consider multiple factors and accurately determine the energy-saving operation range of fans, so as to improve the operating efficiency of fans, reduce energy consumption, and improve the overall economy and operation stability of thermal power units.

[0006] Prior art, such as the Chinese patent with the patent number "CN112101641A", discloses a method for improving the economic efficiency of unconventional peak-shaving of thermal power units. The inventive method first records the operating conditions and output of the unit under different conditions to determine the peak-shaving depth of the unit. Then, a quadratic polynomial is used to establish a coal consumption model for the power supply of the unit. According to the actual operating data of the unit after dust removal, desulfurization, and denitrification modification, the dust removal model and desulfurization and denitrification model under different unit loads are obtained through effective data screening. Finally, the power constraint conditions of the unit are established, and the government fines for excessive emissions and the cost of oil input and stable combustion are fitted during the peak-shaving of the unit, and the environmental protection cost of the unit is calculated. This invention breaks through the previous load distribution method of thermal power units that ignores environmental factors, fully considers the impact of environmental protection factors on the economic benefits of power plants, and establishes the optimal load distribution model for different units to maximize the deep peak-shaving benefits of power plants.

[0007] The problem with the above-mentioned prior art is that this method confirms the environmental protection cost and economic benefit through the dust removal model and the desulfurization and denitrification model, and does not deeply involve the optimization of the energy saving of the unit. There are certain limitations in the overall energy consumption optimization of the thermal power unit, and the opportunity to further reduce energy consumption and improve efficiency may be missed. Summary of the invention

[0008] In order to solve the above technical problems, the present invention proposes a fan energy-saving optimization method and system based on deep peak regulation of thermal power units.

[0009] The technical solution of the present invention is as follows:

[0010] The present invention proposes a fan energy-saving optimization method based on deep peak regulation of thermal power units, comprising the following steps:

[0011] Step S1, collecting historical data of two induced draft fans in the dual-series smoke and air system during operation, including: load data, induced draft fan air volume data and induced draft fan power data;

[0012] Step S2, obtaining a fitting formula of the total power of two induced draft fans and the unit load, a fitting formula of the total air volume of two induced draft fans and the unit load, and a fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan according to the collected historical data;

[0013] Step S3, obtaining the power and load calculation value of a single induced draft fan through the fitting formula of the total air volume of the two induced draft fans and the unit load and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan;

[0014] Step S4, verifying the power and load calculation values ​​of a single induced draft fan through single induced draft fan operation experimental data;

[0015] Step S5, determining the energy-saving operation range of the single induced draft fan and the two induced draft fans according to the fitting formula of the total power of the two induced draft fans and the unit load and the power and load calculation value of the single induced draft fan.

[0016] As a preferred implementation, the fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are obtained based on the collected historical data, wherein the fitting formula of the total air volume of the two induced draft fans and the unit load is a linear function, and the fitting formula of the total power of the two induced draft fans and the unit load and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are both exponential functions.

[0017] As a preferred implementation, after obtaining the fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan, the fitting formula obtained by fitting factor evaluation is calculated as follows:

[0018]

[0019] Where: y i is the data value obtained through historical data; is the predicted value obtained by fitting the formula; The mean of the data values ​​obtained from historical data; i = 1, 2, 3, ..., n, where n is the number of data points.

[0020] As a preferred implementation, the power and load calculation values ​​of a single induced draft fan are verified by using the single induced draft fan operation test data, wherein the single induced draft fan operation test specifically includes the following steps:

[0021] Maintain the load of the dual-series smoke and wind system stable, open the damper of the induced draft fan connecting flue, then gradually reduce the opening of the inlet guide vane of one induced draft fan, and at the same time increase the opening of the inlet guide vane of the other induced draft fan to maintain the furnace pressure stable;

[0022] When the closed induced draft fan inlet guide vane opening is 15%, stop the induced draft fan, close the front and rear baffles of the induced draft fan to prevent backflow, and completely isolate the induced draft fan;

[0023] Under different unit load conditions, keep the single-induced draft fan running stably for a period of time, and record the power consumption of the single-induced draft fan under different unit load conditions.

[0024] On the other hand, the present invention also provides a fan energy-saving optimization system based on deep peak regulation of thermal power units, comprising:

[0025] Data acquisition module: collects historical data of the two induced draft fans in the dual-series smoke and air system during operation, including load data, induced draft fan air volume data and induced draft fan power data;

[0026] Fitting module: According to the collected historical data, the fitting formula of the total power of two induced draft fans and the unit load, the fitting formula of the total air volume of two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are obtained;

[0027] Calculation module: The power and load calculation values ​​of a single induced draft fan are obtained through the fitting formula of the total air volume of two induced draft fans and the unit load and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan;

[0028] Experimental verification module: verify the power and load calculation values ​​of a single induced draft fan through the experimental data of a single induced draft fan operation;

[0029] Energy-saving optimization module: Determine the energy-saving operation range of a single induced draft fan and two induced draft fans based on the fitting formula of the total power of two induced draft fans and the unit load and the calculated value of the power and load of a single induced draft fan.

[0030] As a preferred implementation, the fitting module obtains, based on the collected historical data, a fitting formula for the total power of the two induced draft fans and the unit load, a fitting formula for the total air volume of the two induced draft fans and the unit load, and a fitting formula for the power of a single induced draft fan and the air volume of a single induced draft fan, wherein the fitting formula for the total air volume of the two induced draft fans and the unit load is a linear function, and the fitting formula for the total power of the two induced draft fans and the unit load and the fitting formula for the power of a single induced draft fan and the air volume of a single induced draft fan are both exponential functions.

[0031] As a preferred implementation, after obtaining the fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan through the fitting module, the fitting formula obtained by the fitting factor evaluation is calculated as follows:

[0032]

[0033] Where: y i is the data value obtained through historical data; is the predicted value obtained by fitting the formula; The mean of the data values ​​obtained from historical data; i = 1, 2, 3, ..., n, where n is the number of data points.

[0034] As a preferred implementation, the experimental verification module verifies the power and load calculation values ​​of a single induced draft fan through the single induced draft fan operation experimental data, wherein the single induced draft fan operation experiment specifically includes the following steps:

[0035] Maintain the load of the dual-series smoke and wind system stable, open the damper of the induced draft fan connecting flue, then gradually reduce the opening of the inlet guide vane of one induced draft fan, and at the same time increase the opening of the inlet guide vane of the other induced draft fan to maintain the furnace pressure stable;

[0036] When the closed induced draft fan inlet guide vane opening is 15%, stop the induced draft fan, close the front and rear baffles of the induced draft fan to prevent backflow, and completely isolate the induced draft fan;

[0037] Under different unit load conditions, keep the single-induced draft fan running stably for a period of time, and record the power consumption of the single-induced draft fan under different unit load conditions.

[0038] On the other hand, the present invention further provides an electronic device having a computer program stored thereon, wherein when the computer program is executed by a processor, a method for optimizing fan energy saving based on deep peak regulation of thermal power units as described in any embodiment of the present invention is implemented.

[0039] On the other hand, the present invention also provides a computer-readable medium for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement a fan energy-saving optimization method based on deep peak regulation of thermal power units as described in any embodiment of the present invention.

[0040] The present invention has the following beneficial effects:

[0041] 1. The present invention provides a method for optimizing energy saving of pumps and fans under deep peak regulation conditions of thermal power units, providing a new approach for energy-saving operation of thermal power plants.

[0042] 2. Through the two methods of historical data deduction and optimization, and experimental verification, under the deep peak load condition, the double series pumps and fans of the thermal power units are switched to single and double series operation to achieve the optimal energy saving purpose.

[0043] 3. With the help of historical data calculation, the load turning point when the energy-saving effect is optimal can be inferred, which reduces the amount of experiments and improves efficiency.

[0044] 4. A combination of theoretical deduction and experimental verification is adopted. The power consumption of different operating modes is compared through theoretical calculation, and the theoretical calculation value is verified with experimental results, making the optimization result extremely accurate.

[0045] 5. It provides a reference and reference for the energy-saving operation of other auxiliary equipment of thermal power units, helps to promote energy conservation and carbon reduction of the entire thermal power unit, and promotes thermal power companies to achieve better energy-saving effects under deep peak-shaving conditions. It has positive significance for thermal power companies to break through themselves and move towards transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 This is a schematic diagram of the method flow of Example 1;

[0048] Figure 2 This is a schematic diagram of the dual series smoke and air system flow chart;

[0049] Figure 3 Design shaft power and efficiency diagrams for induced draft fans under various operating conditions;

[0050] Figure 4 It is the fitting diagram of the total air volume of two induced draft fans and the unit load;

[0051] Figure 5 It is the fitting diagram of the total power of two induced draft fans and the unit load;

[0052] Figure 6 It is the fitting diagram of the power of a single induced draft fan and the air volume of a single induced draft fan;

[0053] Figure 7 This is a schematic diagram of the changes in power consumption of single and double induced draft fans with group load. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0056] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0057] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0058] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0059] Embodiment 1:

[0060] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be combined with the specific embodiments of the present application and refer to the attached Figure 1 , clearly and completely describe the technical solution of the present invention.

[0061] In order to solve the problems in the prior art, the present invention provides a fan energy-saving optimization method based on deep peak regulation of thermal power units, comprising the following steps:

[0062] Step S1, collecting historical data of two induced draft fans in the dual-series smoke and air system during operation, including: load data, induced draft fan air volume data and induced draft fan power data;

[0063] In this embodiment:

[0064] Take a 600MW unit in a thermal power plant, where the boiler is a π-type structure and the smoke and air system is a double series structure symmetrical on the A and B sides. There are 6 coal mills, 24 burners, 2 primary fans, 2 forced draft fans, 2 induced draft fans and 2 air preheaters. Each coal mill is equipped with 4 burners, with three layers of upper, middle and lower layers, and the front and rear walls are counter-burned. Figure 2 The schematic diagram of the smoke and wind system flow chart is shown. The single-side primary fan, blower, air preheater, and induced draft fan are a series. When the single-series smoke and wind system is in operation, the unit can carry a maximum load of 55%, that is, 330MW. The primary fan dries the pulverized coal from the coal mill and transports it to the burner for combustion. The blower is used to maintain the amount of oxygen required for the combustion of pulverized coal by supplementing air. The induced draft fan maintains the negative pressure of the furnace by extracting smoke. The structure of the dual-series smoke and wind system not only solves the practical problem of insufficient output of a single device, but also increases the flexibility and stability of the thermal power unit. When any device in the single-side smoke and wind system fails, the load of the unit can be reduced and the single-side smoke and wind system can be shut down to achieve online maintenance without stopping the machine.

[0065] The motor of a certain induced draft fan runs at a fixed frequency, and the inlet guide vane is used to adjust the flow. Figure 3 As shown in the figure, the design shaft power and efficiency of the induced draft fan under various working conditions. The design inlet temperature of the induced draft fan is 110℃, and the inlet density is 0.89kg / m 3 . When the unit load is 350MW, the shaft power and efficiency of the induced draft fan are 1138KW and 60.9% respectively. When the unit load increases from 350MW to TB condition, the shaft power of the induced draft fan shows a continuous growth trend, from 1138KW to 3329KW, however, the efficiency of the induced draft fan shows a trend of first increasing and then decreasing. When the unit load increases from 350MW to 480MW, the efficiency of the induced draft fan increases from 60.9% to 80.1%, with the largest increase of 19.2%. Under BMCR condition, the efficiency of the induced draft fan is the highest, at 86.2%. When the output of the induced draft fan continues to increase to TB condition, the efficiency of the induced draft fan decreases to 84.8%. The increase in the flow rate and output of the induced draft fan is the reason for the continuous increase in the shaft power of the induced draft fan. From 350MW to BMCR condition, the opening of the inlet guide vane of the induced draft fan has been increasing, and the throttling loss has gradually decreased, so the efficiency of the induced draft fan has been continuously improved. From the BMCR condition to the TB condition, the opening of the induced draft fan inlet guide vane remains unchanged at the maximum, and the increase in the induced draft fan flow causes an increase in the local resistance loss, so the efficiency of the induced draft fan decreases.

[0066] Step S2, obtaining a fitting formula of the total power of two induced draft fans and the unit load, a fitting formula of the total air volume of two induced draft fans and the unit load, and a fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan according to the collected historical data;

[0067] The fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are obtained based on the collected historical data, wherein the fitting formula of the total air volume of the two induced draft fans and the unit load is a linear function, and the fitting formula of the total power of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are both exponential functions.

[0068] In this embodiment:

[0069] like Figure 4 The fitting formula of the total air volume of the two induced draft fans and the unit load is as follows:

[0070] y1=3.022x1+288.81;

[0071] The fitting formula of the total air volume of the two induced draft fans and the unit load is a linear function, and the two show a positive correlation. When the unit load is 230MW, the total air volume is 1056KNm 3 / h, the ratio of total air volume to unit load is 4.59KNm 3 / MWh. When the unit load increases to 590MW, the total wind volume is 2109KNm 3 / h, the ratio of total air volume to unit load is 3.57KNm 3 / MWh.

[0072] As the total air volume increases with the unit load, the flue gas volume also increases with the unit load. Figure 5 The fitting formula of the total power of the two induced draft fans and the unit load is as follows:

[0073]

[0074] The fitting formula of the total power of the two induced draft fans and the unit load is an exponential function. The total power of the induced draft fans increases with the increase of the unit load. When the load is 230MW, the total power of the induced draft fans is 2531KWh. When the load increases to 300MW, the total power of the induced draft fans is 2669KWh, and the total power growth rate of the induced draft fans is 1.97KWh / MW. When the load is 500MW, the total power of the induced draft fans is 4503KWh. When the load increases to 590MW, the total power of the induced draft fans is 5943KWh, and the total power growth rate of the induced draft fans is 16KWh / MW. Compared with the low load stage of 230-300MW, in the high load stage of 500-590MW, the total power of the induced draft fans increases rapidly with the increase of the unit load.

[0075] The total power of the induced draft fan increases rapidly with the increase of the unit load. The reason is that the power of the induced draft fan is affected by the air volume and increases rapidly with the increase of the air volume of the induced draft fan. Figure 6 As shown in the figure, the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan is as follows:

[0076]

[0077] When the unit load is 230MW, the total air volume is 1056KNm 3 / h, the power of a single induced draft fan is 2531KWh, the load increases to 300MW, the total air volume is 1162KNm3 / h, the power of a single induced draft fan is 2669KWh, and the growth rate of a single induced draft fan power is 1.30KWh2 / KNm 3 When the load is 500MW, the total air volume is 1770KNm 3 / h, the power of a single induced draft fan is 4503KWh, the load increases to 590MW, and the total air volume is 2109KNm 3 / h, the power of a single induced draft fan is 5943KWh, and the growth rate of the induced draft fan power is 4.25KWh 2 / KNm 3 Compared with the low load stage of 230-300MW, the air volume of the induced draft fan is also at a higher level in the high load stage of 500-590MW. The power of a single induced draft fan increases rapidly with the increase of the induced draft fan air volume. The higher the load, the more electricity the induced draft fan consumes for each increase in air volume. The reason is that the pipeline resistance of the induced draft fan gradually increases. The calculation formula for the pipeline resistance of the induced draft fan is as follows:

[0078]

[0079] Where: r is the pipe resistance; λ is the friction resistance coefficient; D is the pipe diameter; v is the flue gas velocity; g is the gravitational acceleration; ρ is the flue gas density.

[0080] The flow area of ​​the smoke and air system of a thermal power unit is constant. When the unit is operating normally, the smoke damper is in a fully open state, and the pipe resistance is proportional to the square of the smoke flow velocity. The smoke flow velocity increases with the increase of the induced draft fan air volume, and the pipe resistance increases squarely with the increase of the smoke flow velocity. Therefore, as the unit load increases, the total induced draft fan air volume increases, the smoke flow velocity increases, the smoke and air system pipe resistance increases, and the total induced draft fan power also increases.

[0081] After obtaining the fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan, the fitting formula obtained by evaluating the fitting factor is calculated as follows:

[0082]

[0083] Where: y i is the data value obtained through historical data; is the predicted value obtained by fitting the formula; The mean of the data values ​​obtained from historical data; i = 1, 2, 3, ..., n, where n is the number of data points.

[0084] In this embodiment:

[0085] The fitting factor of the fitting formula for the total air volume of the two induced draft fans and the unit load is 0.979, the fitting factor of the fitting formula for the total power of the two induced draft fans and the unit load is 0.967, and the fitting factor of the fitting formula for the power of a single induced draft fan and the air volume of a single induced draft fan is 0.955, indicating that the fitting formula used is highly consistent with the actual operating conditions.

[0086] Step S3, obtaining the power and load calculation value of a single induced draft fan through the fitting formula of the total air volume of the two induced draft fans and the unit load and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan;

[0087] Step S4, verifying the power and load calculation values ​​of a single induced draft fan through single induced draft fan operation experimental data;

[0088] The single induced draft fan power and load calculation values ​​are verified by using the single induced draft fan operation test data, wherein the single induced draft fan operation test specifically includes the following steps:

[0089] Maintain the load of the dual-series smoke and wind system stable, open the damper of the induced draft fan connecting flue, then gradually reduce the opening of the inlet guide vane of one induced draft fan, and at the same time increase the opening of the inlet guide vane of the other induced draft fan to maintain the furnace pressure stable;

[0090] When the closed induced draft fan inlet guide vane opening is 15%, stop the induced draft fan, close the front and rear baffles of the induced draft fan to prevent backflow, and completely isolate the induced draft fan;

[0091] Under different unit load conditions, keep the single-induced draft fan running stably for a period of time, and record the power consumption of the single-induced draft fan under different unit load conditions.

[0092] In this embodiment:

[0093] In order to ensure the safe and stable operation of the unit, only the A induced draft fan is shut down during the single-side smoke and wind system shutdown experiment to reduce the amount of operation, control the risk source, and avoid huge disturbances causing the machine to trip. Maintaining the total air volume of the smoke and wind system unchanged, two primary fans and two supply fans are operated at the same time, and the changes in the total power consumption of the induced draft fan when a single induced draft fan is operated and two induced draft fans are operated are compared. The single induced draft fan operation experiment is carried out under the unit load of 300MW. Specifically, to maintain the stability of the unit load, first, open the induced draft fan connecting flue damper, then gradually close the opening of the A induced draft fan inlet guide vane, open the opening of the B induced draft fan inlet guide vane, and maintain the furnace pressure between ±100Pa. When the opening of the A induced draft fan inlet guide vane is closed to 15%, shut down the A induced draft fan, close the front and rear dampers of the A induced draft fan to prevent backflow, thereby completely isolating the A induced draft fan. Under the 300MW condition, maintain the B induced draft fan to run stably for 4 hours alone, and record the power consumption of the B induced draft fan. Then, reduce the unit load to 240MW at a rate of 3MW / min. After running stably for another 4 hours, record the power consumption of the B induced draft fan when it runs alone under the 240MW condition. After the experiment, restart the A induced draft fan under the 240MW load and merge it into the smoke and air system. The experimental results and the fitting calculation results show a high degree of consistency, which verifies the accuracy and reliability of the theoretical calculation value of the fitting formula.

[0094] Step S5, determining the energy-saving operation range of the single induced draft fan and the two induced draft fans according to the fitting formula of the total power of the two induced draft fans and the unit load and the power and load calculation value of the single induced draft fan.

[0095] In this embodiment:

[0096] like Figure 7As shown in the figure, the power consumption of single and double induced draft fans changes with the unit load. Whether a single induced draft fan is operated independently or two induced draft fans are operated in parallel, the power consumption of the induced draft fan increases with the increase of the unit load. When a single induced draft fan is operated independently, the unit load increases from 200MW to 300MW, and the power consumption of the induced draft fan increases from 2231KWh to 3645KWh, an increase of 1414KWh. When two induced draft fans are operated in parallel, the unit load increases from 200MW to 300MW, and the total power consumption of the induced draft fans increases from 2385KWh to 2746KWh, an increase of 361KWh. In the load range of 200-300MW, the increase in the power consumption of the induced draft fan when a single induced draft fan is operated independently is much higher than the increase in the total power consumption of the induced draft fans when two induced draft fans are operated in parallel. When a single induced draft fan operates independently, the fan air volume is at a high level, the wind speed is high, and the pipe resistance is large, so the induced draft fan power consumption increases significantly. When two induced draft fans operate in parallel, the air volume of each induced draft fan is only half of the air volume when a single induced draft fan operates independently, the fan air volume is at a low level, the wind speed is low, and the pipe resistance is small, so the induced draft fan power consumption increases slightly.

[0097] When the unit load is 220MW, the power consumption of single and double induced draft fans is equivalent, which is 2459KWh and 2443KWh respectively, with a difference of only 16KWh. When the unit load is in the range of 220-300MW, the power consumption of a single induced draft fan is higher than the total power consumption of two induced draft fans, and the gap between the two becomes larger with the increase of load. When the load is 240MW, the difference between the two is 205KWh, and when the load is 300MW, the difference between the two is 899KWh. When the unit load is in the range of 200-220MW, the power consumption of a single induced draft fan is lower than the total power consumption of two induced draft fans, and the gap between the two becomes larger with the decrease of load. When the load is 210MW, the difference between the two is 71KWh, and when the load is 200MW, the difference between the two is 154KWh. The unit load of 220MW is the dividing point where the operation of a single induced draft fan is more energy-efficient than the operation of two induced draft fans. In the specific experiments of the unit load of 240MW and 300MW, single and double induced draft fans were operated. When the load was 240MW, the power consumption of a single induced draft fan was 2762KWh, and the total power consumption of two induced draft fans was 2473KWh, with a difference of 289KWh. When the load was 300MW, the power consumption of a single induced draft fan was 3499KWh, and the total power consumption of two induced draft fans was 2649KWh, with a difference of 850KWh. The experimental results and the fitting calculation results showed a high degree of consistency, which verified the accuracy and reliability of the theoretical calculation value of the fitting formula.

[0098] According to the fan energy-saving optimization method based on deep peak regulation of thermal power units of the present invention, a pump energy-saving optimization method for deep peak regulation of thermal power units can be obtained similarly.

[0099] Embodiment 2:

[0100] This embodiment provides a fan energy-saving optimization system based on deep peak regulation of thermal power units, including:

[0101] Data acquisition module: collects historical data of the two induced draft fans in the dual-series smoke and air system during operation, including load data, induced draft fan air volume data and induced draft fan power data;

[0102] Fitting module: According to the collected historical data, the fitting formula of the total power of two induced draft fans and the unit load, the fitting formula of the total air volume of two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are obtained;

[0103] Calculation module: The power and load calculation values ​​of a single induced draft fan are obtained through the fitting formula of the total air volume of two induced draft fans and the unit load and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan;

[0104] Experimental verification module: verify the power and load calculation values ​​of a single induced draft fan through the experimental data of a single induced draft fan operation;

[0105] Energy-saving optimization module: Determine the energy-saving operation range of a single induced draft fan and two induced draft fans based on the fitting formula of the total power of two induced draft fans and the unit load and the calculated value of the power and load of a single induced draft fan.

[0106] Embodiment three:

[0107] This embodiment provides an electronic device having a computer program stored thereon. When the computer program is executed by a processor, a method for optimizing fan energy saving based on deep peak regulation of a thermal power unit as described in any embodiment of the present invention is implemented.

[0108] Embodiment 4:

[0109] This embodiment provides a computer-readable medium for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement a fan energy-saving optimization method based on deep peak regulation of thermal power units as described in any embodiment of the present invention.

[0110] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0111] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0112] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0113] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0114] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fan energy-saving optimization method based on deep peak regulation of thermal power units, characterized in that: The following steps are involved: Step S1, collecting historical data of two induced draft fans in the dual-series smoke and air system during operation, including: load data, induced draft fan air volume data and induced draft fan power data; Step S2, obtaining a fitting formula of the total power of two induced draft fans and the unit load, a fitting formula of the total air volume of two induced draft fans and the unit load, and a fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan according to the collected historical data; Step S3, obtaining the power and load calculation value of a single induced draft fan through the fitting formula of the total air volume of the two induced draft fans and the unit load and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan; Step S4, verifying the power and load calculation values ​​of a single induced draft fan through single induced draft fan operation experimental data; Step S5, determining the energy-saving operation range of the single induced draft fan and the two induced draft fans according to the fitting formula of the total power of the two induced draft fans and the unit load and the power and load calculation value of the single induced draft fan.

2. The fan energy-saving optimization method based on deep peak regulation of thermal power units according to claim 1 is characterized in that: The fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are obtained based on the collected historical data, wherein the fitting formula of the total air volume of the two induced draft fans and the unit load is a linear function, and the fitting formula of the total power of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are both exponential functions.

3. The fan energy-saving optimization method based on deep peak regulation of thermal power units according to claim 2 is characterized in that: After obtaining the fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan, the fitting formula obtained by evaluating the fitting factor is calculated as follows: Where: y i is the data value obtained through historical data; is the predicted value obtained by fitting the formula; The mean of the data values ​​obtained from historical data; i = 1, 2, 3, ..., n, where n is the number of data points.

4. The fan energy-saving optimization method based on deep peak regulation of thermal power units according to claim 1 is characterized in that: The single induced draft fan power and load calculation values ​​are verified by using the single induced draft fan operation test data, wherein the single induced draft fan operation test specifically includes the following steps: Maintain the load of the dual-series smoke and wind system stable, open the damper of the induced draft fan connecting flue, then gradually reduce the opening of the inlet guide vane of one induced draft fan, and at the same time increase the opening of the inlet guide vane of the other induced draft fan to maintain the furnace pressure stable; When the closed induced draft fan inlet guide vane opening is 15%, stop the induced draft fan, close the front and rear baffles of the induced draft fan to prevent backflow, and completely isolate the induced draft fan; Under different unit load conditions, keep the single-induced draft fan running stably for a period of time, and record the power consumption of the single-induced draft fan under different unit load conditions.

5. A fan energy-saving optimization system based on deep peak regulation of thermal power units, characterized in that: include: Data acquisition module: collects historical data of the two induced draft fans in the dual-series smoke and air system during operation, including load data, induced draft fan air volume data and induced draft fan power data; Fitting module: According to the collected historical data, the fitting formula of the total power of two induced draft fans and the unit load, the fitting formula of the total air volume of two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan are obtained; Calculation module: The power and load calculation values ​​of a single induced draft fan are obtained through the fitting formula of the total air volume of two induced draft fans and the unit load and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan; Experimental verification module: verify the power and load calculation values ​​of a single induced draft fan through the experimental data of a single induced draft fan operation; Energy-saving optimization module: Determine the energy-saving operation range of a single induced draft fan and two induced draft fans based on the fitting formula of the total power of two induced draft fans and the unit load and the calculated value of the power and load of a single induced draft fan.

6. The fan energy-saving optimization system based on deep peak regulation of thermal power units according to claim 5 is characterized in that: The fitting module obtains, based on the collected historical data, a fitting formula for the total power of the two induced draft fans and the unit load, a fitting formula for the total air volume of the two induced draft fans and the unit load, and a fitting formula for the power of a single induced draft fan and the air volume of a single induced draft fan, wherein the fitting formula for the total air volume of the two induced draft fans and the unit load is a linear function, and the fitting formula for the total power of the two induced draft fans and the unit load, and the fitting formula for the power of a single induced draft fan and the air volume of a single induced draft fan are both exponential functions.

7. The fan energy-saving optimization method based on deep peak regulation of thermal power units according to claim 6 is characterized in that: After obtaining the fitting formula of the total power of the two induced draft fans and the unit load, the fitting formula of the total air volume of the two induced draft fans and the unit load, and the fitting formula of the power of a single induced draft fan and the air volume of a single induced draft fan through the fitting module, the fitting formula obtained by the fitting factor evaluation is calculated as follows: Where: y i is the data value obtained through historical data; is the predicted value obtained by fitting the formula; The mean of the data values ​​obtained from historical data; i = 1, 2, 3, ..., n, where n is the number of data points.

8. The fan energy-saving optimization method based on deep peak regulation of thermal power units according to claim 1 is characterized in that: The experimental verification module verifies the power and load calculation values ​​of a single induced draft fan through the experimental data of a single induced draft fan operation, wherein the single induced draft fan operation experiment specifically includes the following steps: Maintain the load of the dual-series smoke and wind system stable, open the damper of the induced draft fan connecting flue, then gradually reduce the opening of the inlet guide vane of one induced draft fan, and at the same time increase the opening of the inlet guide vane of the other induced draft fan to maintain the furnace pressure stable; When the closed induced draft fan inlet guide vane opening is 15%, stop the induced draft fan, close the front and rear baffles of the induced draft fan to prevent backflow, and completely isolate the induced draft fan; Under different unit load conditions, keep the single-induced draft fan running stably for a period of time, and record the power consumption of the single-induced draft fan under different unit load conditions.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for optimizing fan energy saving based on deep peak regulation of thermal power units as described in any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a fan energy-saving optimization method based on deep peak regulation of thermal power units as described in any one of claims 1 to 4 is implemented.

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