APS wide-load automatic control system based on powder preparation depth peak regulation

Abstract

The invention relates to the field of coal mill power control, is used for solving the problem of overhigh energy consumption of a coal mill caused by insufficient adjusting capacity of the coal mill in the peak regulation operation process of a thermal generator set, and particularly relates to an APS wide-load automatic control system based on powder preparation depth peak regulation. According to the method, modeling is carried out on the peak regulation rule, a thermal power generating unit peak regulation rule model is generated according to historical data statistics, and therefore the regulation rule of the thermal power generating unit is accurately captured, fuel dynamic matching analysis is carried out according to the regulation rule of the thermal power generating unit, and a fuel quantity change model is constructed based on fuel consumption and residual quantity; and linkage with the peak regulation model is carried out to predict the future load fluctuation trend, so that the parameters of the powder making model are adjusted in advance, the impact of sudden load change on the stability of the unit is reduced, the dynamic adaptation of fuel supply and peak regulation requirements is realized, and the response precision and flexibility of the coal mill in a wide load scene are improved.

Description

Technical Field

[0001] The present invention relates to the field of coal mill power control, and specifically to an APS wide-load automatic control system based on pulverized coal preparation depth peak shaving. Background Art

[0002] At present, large-scale thermal power generating units are facing the dual pressures of energy conservation, emission reduction, and high requirements for unit flexibility, resulting in a decline in unit economy. Large-scale thermal power plants have begun to use various energy conservation, emission reduction technologies, and technologies to improve unit flexibility to transform large-scale thermal power generating units. Among them, the deep peak shaving technology of thermal power plants can adjust the power generation of thermal power plants, thereby obtaining better power generation coupling, improving economic benefits, and saving energy and reducing emissions;

[0003] During the thermal power generation process, the coal mill is the main equipment of the pulverized coal preparation system of the thermal power plant. With the deep peak shaving operation of thermal power generation, the fuel demand for thermal power generation will change. If the coal mill cannot follow the change in the power generation of thermal power generation in a coupled manner, it will lead to uncertain coal powder supply of the coal mill, and at the same time, it is easy to cause the coal mill to start and stop frequently, resulting in discontinuous fuel control and a significant increase in energy consumption. Therefore, it is necessary to introduce an APS system to manage the load of the pulverized coal preparation operation of the coal mill, thereby improving the operating energy efficiency of the coal mill;

[0004] In view of the above technical problems, the present application proposes a solution. Summary of the Invention

[0005] In the present invention, by modeling the peak shaving law and generating a peak shaving law model of the thermal power unit according to historical data statistics, the adjustment law of the thermal power unit can be accurately captured, and based on the adjustment law of the thermal power unit, fuel dynamic matching analysis is carried out. A fuel quantity change model is constructed based on the fuel consumption and remaining quantity, and is linked with the peak shaving model to predict the future load fluctuation trend, thereby adjusting the parameters of the pulverized coal preparation model in advance, reducing the impact of load mutation on the stability of the unit, realizing the dynamic adaptation of fuel supply and peak shaving demand, improving the response accuracy and flexibility of the coal mill in the wide-load scenario, and solving the problem that the adjustment ability of the coal mill is insufficient during the peak shaving operation of the thermal power generating unit, resulting in too high energy consumption of the coal mill, and an APS wide-load automatic control system based on pulverized coal preparation depth peak shaving is proposed.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] An APS wide-load automatic control system based on pulverized coal preparation depth peak shaving includes a peak shaving model generation unit, and the peak shaving model generation unit is used to statistically analyze the peak shaving operation of the thermal power unit and generate an empirical peak shaving law model of the thermal power unit according to the statistical results;

[0008] A fuel management unit, which statistically analyzes the fuel supply situation of a thermal power unit, records the fuel consumption and the remaining fuel quantity, constructs a fuel quantity change model, obtains a peak shaving law model through a peak shaving model generation unit, and matches the fuel change model and the peak shaving law model;

[0009] A pulverizing model generation unit, which is used to statistically analyze the operating load and start-stop status of a coal mill and generate a pulverizing load model;

[0010] An efficiency overall management unit, which obtains the pulverizing load model through the pulverizing model generation unit, conducts a balance analysis on the pulverizing quantity, pulverizing load, and pulverizing consumption according to the pulverizing load model, generates the pulverizing energy efficiency, and determines whether the pulverizing energy efficiency meets the requirements;

[0011] A wide load prediction and regulation unit, which obtains the judgment result of the pulverizing energy efficiency through the efficiency overall management unit, then obtains the matching result of the fuel change model and the peak shaving law model, makes a prediction on the fuel change model, and sends the prediction result to the pulverizing model generation unit to improve the pulverizing energy efficiency of the pulverizing model generation unit.

[0012] As a preferred embodiment of the present invention, when statistically analyzing the peak shaving operation of the thermal power unit, the peak shaving model generation unit takes a set time interval as a unit, statistically analyzes the power generation operation power of the thermal power unit, and records the power generation operation power with 24 hours as a short cycle, and records it as the power generation operation power change in a short cycle;

[0013] The peak shaving model generation unit obtains all the short-cycle power generation operation power changes within a month, obtains multiple groups of short-cycle power generation operation power changes, and calculates the arithmetic average of the power generation operation powers at the same time points in each short cycle to obtain the average power generation operation power at each time point within a month. The peak shaving model generation unit takes the average power generation operation power as the vertical axis and 24 hours as the horizontal axis, creates a data point every set time interval on the horizontal axis, obtains the mean change curve of the power generation operation power, and takes the mean change curve of the power generation operation power as the peak shaving law model of the thermal power unit.

[0014] As a preferred embodiment of the present invention, when statistically analyzing the fuel consumption, the fuel management unit conducts the statistics at the same time interval as the statistics of the peak shaving operation of the thermal power unit to obtain the fuel consumption between each time interval, and obtains the remaining fuel quantity at the same time interval;

[0015] The fuel management unit constructs a fuel consumption curve according to the time interval and the fuel consumption, and constructs a remaining fuel quantity curve according to the time interval and the remaining fuel quantity;

[0016] The fuel management unit overlaps and compares the fuel consumption curve with the peak shaving law model, and obtains the ratio relationship between the power generation operation power and the fuel consumption speed through the ratio of the power generation operation power to the fuel consumption in the peak shaving law model.

[0017] As a preferred embodiment of the present invention, when the coal pulverizing model generation unit operates the coal mill, it statistically records the operation load of the coal mill at the same time interval as the peak shaving operation, and when the coal mill is shut down, records the operation load as 0;

[0018] The coal pulverizing model generation unit generates a coal pulverizing load model with time as the horizontal axis and the operation power of the coal mill as the vertical axis.

[0019] As a preferred embodiment of the present invention, the efficiency overall management unit obtains the fuel remaining amount curve and the coal pulverizing load model, overlaps and compares the curves in the fuel remaining amount curve and the coal pulverizing load model, and obtains the ratio of the coal pulverizing load to the fuel remaining amount corresponding to each horizontal axis point, which is recorded as the coal pulverizing ratio.

[0020] As a preferred embodiment of the present invention, the efficiency overall management unit obtains the fuel remaining amount curve and the fuel consumption curve through the fuel management unit, sums up the vertical axis of the fuel consumption curve and the difference between the two ends of the fuel remaining amount curve to obtain the total coal pulverizing amount;

[0021] The efficiency overall management unit obtains the total energy consumption of the coal mill through the electric energy metering device;

[0022] The efficiency overall management unit obtains the coal pulverizing energy efficiency through the calculation model, compares the coal pulverizing energy efficiency with the set energy efficiency, and generates an energy efficiency qualified signal or an energy efficiency unqualified signal according to the comparison result.

[0023] As a preferred embodiment of the present invention, the wide load prediction and adjustment unit does not perform adjustment after obtaining the energy efficiency qualified signal;

[0024] After obtaining the energy efficiency unqualified signal, the wide load prediction and adjustment unit analyzes the coal pulverizing ratio:

[0025] The wide load prediction and adjustment unit obtains the preset high ratio and low ratio, and compares the coal pulverizing ratio with the high ratio and the low ratio respectively. If the coal pulverizing ratio is greater than the high ratio or less than the low ratio, it is recorded as a normal point. If the coal pulverizing ratio is between the high ratio and the low ratio, it is recorded as an abnormal point;

[0026] The wide-load prediction unit obtains the abscissa corresponding to the abnormal point, and obtains the remaining fuel quantity corresponding to the abscissa through the remaining fuel quantity curve. If the remaining fuel quantity is greater than the set threshold, the pulverizing ratio is adjusted towards a lower ratio; if the remaining fuel quantity is less than or equal to the set threshold, the pulverizing ratio is adjusted towards a higher ratio.

[0027] As a preferred embodiment of the present invention, the wide-load prediction unit performs real-time analysis based on the peak-shaving power model and the remaining fuel quantity curve, and sends the analysis result to the pulverizing model generation unit to perform real-time adjustment of the pulverizing power.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. In the present invention, by modeling the peak-shaving rule and generating a peak-shaving rule model for thermal power units based on historical data statistics, the adjustment rule of thermal power units can be accurately captured, and based on the adjustment rule of thermal power units, dynamic fuel matching analysis is performed. A fuel quantity change model is constructed based on fuel consumption and remaining quantity, and is linked with the peak-shaving model to achieve dynamic adaptation of fuel supply and peak-shaving demand, and improve the response accuracy and flexibility of the coal mill in the wide-load scenario.

[0030] 2. In the present invention, by modeling the pulverizing load and performing balance analysis based on the modeling result, closed-loop management of pulverizing energy efficiency is achieved. By statistically analyzing the output and energy consumption of the coal mill, balance analysis of pulverizing quantity, load, and consumption is performed, the energy efficiency compliance is judged in real time, and feedback optimization is performed when the energy efficiency does not meet the standard, so as to ensure that the energy consumption during the pulverizing process is always at a relatively optimal level and achieve the purpose of energy conservation and emission reduction.

[0031] 3. In the present invention, by integrating the peak-shaving rule model, fuel change model, and pulverizing energy efficiency result, the future load fluctuation trend is predicted, so as to adjust the pulverizing model parameters in advance, reduce the impact of load mutation on the unit stability, ensure the reliability of full-condition operation, and avoid the coal mill from stopping due to excessive pulverized coal storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0033] Figure 1 is the system block diagram of the present invention;

[0034] Figure 2 is the system flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] Please refer to Figure 1 - Figure 2 As shown in the figure, the APS wide-load automatic control system based on the peak shaving of pulverized coal depth includes a peak shaving model generation unit, a fuel management unit, a pulverized coal model generation unit, an efficiency overall management unit, and a wide-load prediction and adjustment unit;

[0038] The peak shaving model generation unit is used to statistically analyze the peak shaving operation of the thermal power unit. When statistically analyzing the peak shaving operation of the thermal power unit, the power generation operation power of the thermal power unit is statistically analyzed in units of a set time interval, and the power generation operation power is recorded in a short cycle of 24 hours, and the power generation operation power change in a short cycle is recorded;

[0039] The peak shaving model generation unit obtains all the short-cycle power generation operation power changes within a month, obtains multiple groups of short-cycle power generation operation power changes, and calculates the arithmetic mean of the power generation operation power at the same time points in each short cycle to obtain the average power generation operation power at each time point within a month. The peak shaving model generation unit uses the average power generation operation power as the vertical axis and 24 hours as the horizontal axis, and creates a data point every set time interval on the horizontal axis to obtain the mean change curve of the power generation operation power, and uses the mean change curve of the power generation operation power as the peak shaving law model of the thermal power unit;

[0040] The fuel management unit statistically analyzes the fuel supply situation of the thermal power unit, records the fuel consumption and the remaining fuel. When statistically analyzing the fuel consumption, the fuel management unit statistically analyzes it at the same time interval as the statistical peak shaving operation of the thermal power unit to obtain the fuel consumption between each time interval, and at the same time obtains the remaining fuel at the same time interval;

[0041] The fuel management unit constructs a fuel consumption curve based on the time interval and the fuel consumption, and constructs a remaining fuel curve based on the time interval and the remaining fuel;

[0042] The fuel management unit overlaps and compares the fuel consumption curve with the peak shaving law model, and obtains the ratio relationship between the power generation operation power and the fuel consumption speed through the ratio of the power generation operation power and the fuel consumption in the peak shaving law model, so as to facilitate calculating the fuel consumption required when the power generation operation power lasts for a certain period of time;

[0043] The pulverizing model generation unit is used to count the operating load and start / stop status of the coal mill. When the coal mill is operating, the pulverizing model generation unit counts the operating load of the coal mill at the same time interval as the peak shaving operation. When the coal mill is shut down, the operating load is recorded as 0;

[0044] The pulverizing model generation unit generates a pulverizing load model with time as the horizontal axis and the operating power of the coal mill as the vertical axis;

[0045] The efficiency overall management unit obtains the pulverizing load model through the pulverizing model generation unit, conducts a balance analysis on the pulverizing amount, pulverizing load, and pulverizing consumption according to the pulverizing load model, generates the pulverizing energy efficiency, and determines whether the pulverizing energy efficiency meets the requirements. The specific method is as follows:

[0046] Step 1: The efficiency overall management unit obtains the fuel remaining amount curve and the pulverizing load model, and through the coincidence comparison of the curves in the fuel remaining amount curve and the pulverizing load model, obtains the ratio of the pulverizing load to the fuel remaining amount corresponding to each horizontal axis point, which is recorded as the pulverizing ratio;

[0047] Step 2: The efficiency overall management unit obtains the fuel remaining amount curve and the fuel consumption curve through the fuel management unit, and sums the vertical axis of the fuel consumption curve and the difference between the two ends of the fuel remaining amount curve to calculate the total pulverizing amount;

[0048] Step 3: The efficiency overall management unit obtains the total energy consumption of the coal mill through the electric energy metering device;

[0049] Step 4: The efficiency overall management unit obtains the pulverizing energy efficiency through the calculation model, compares the pulverizing energy efficiency with the set energy efficiency, and generates an energy efficiency qualified signal or an energy efficiency unqualified signal according to the comparison result.

[0050] Embodiment 2:

[0051] Please refer to Figure 1 - Figure 2 As shown, the wide-load prediction and regulation unit obtains the pulverizing energy efficiency judgment result through the efficiency overall management unit. After obtaining the energy efficiency qualified signal, the wide-load prediction and regulation unit does not perform regulation;

[0052] After obtaining the energy efficiency unqualified signal, the wide-load prediction and regulation unit obtains the preset high ratio and low ratio, and compares the pulverizing ratio with the high ratio and the low ratio respectively. If the pulverizing ratio is greater than the high ratio or less than the low ratio, it is recorded as a normal point. If the pulverizing ratio is between the high ratio and the low ratio, it is recorded as an abnormal point;

[0053] The wide-load prediction unit obtains the abscissa corresponding to the abnormal point, and obtains the remaining fuel quantity corresponding to the abscissa through the remaining fuel quantity curve. If the remaining fuel quantity is greater than the set threshold, the pulverizing ratio is adjusted to a lower ratio; if the remaining fuel quantity is less than or equal to the set threshold, the pulverizing ratio is adjusted to a higher ratio.

[0054] The wide-load prediction unit then obtains the matching result of the fuel change model and the peak shaving law model, conducts real-time analysis based on the peak shaving power model and the remaining fuel quantity curve. Through the power change curve in the peak shaving power model, combined with the ratio relationship between the power generation operation power and the fuel consumption speed, calculates the amount of pulverized coal required for the future power generation operation power. Calculates based on the required amount of pulverized coal and the current remaining pulverized coal quantity, makes a prediction for the fuel change model, and thus calculates the production quantity of pulverized coal according to the production process standard requirements of the remaining pulverized coal quantity, and further predicts the future pulverizing power. Sends the prediction result to the pulverizing model generation unit to adjust the pulverizing power in real time and improve the pulverizing energy efficiency of the pulverizing model generation unit.

[0055] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific implementation manners. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. APS wide-load automatic control system based on powder-making depth peak shaving, characterized in that It includes a peak shaving model generation unit which is used to conduct statistics on the peak shaving operation of a thermal power unit, generate experience based on the statistical results, and obtain a peak shaving law model for the thermal power unit; A fuel management unit which conducts statistics on the fuel supply situation of the thermal power unit, records the fuel consumption and the remaining fuel quantity, constructs a fuel quantity change model, obtains the peak shaving law model through the peak shaving model generation unit, and matches the fuel change model with the peak shaving law model; A pulverizing model generation unit which is used to conduct statistics on the operating load and start-stop status of a coal mill and generate a pulverizing load model; An efficiency overall management unit which obtains the pulverizing load model through the pulverizing model generation unit, conducts a balance analysis on the pulverizing quantity, pulverizing load, and pulverizing consumption according to the pulverizing load model, generates the pulverizing energy efficiency, and determines whether the pulverizing energy efficiency meets the requirements; A wide load prediction and regulation unit which obtains the judgment result of the pulverizing energy efficiency through the efficiency overall management unit, then obtains the matching result of the fuel change model and the peak shaving law model, makes a prediction on the fuel change model, and sends the prediction result to the pulverizing model generation unit to improve the pulverizing energy efficiency of the pulverizing model generation unit.

2. The APS wide-load automatic control system based on the peak shaving of the milling depth according to claim 1, wherein When conducting statistics on the peak shaving operation of the thermal power unit, the peak shaving model generation unit takes a set time interval as a unit to conduct statistics on the power generation operating power of the thermal power unit, and takes 24 hours as a short cycle to record the power generation operating power, recording it as the power generation operating power change in a short cycle; The peak shaving model generation unit obtains all the power generation operating power changes in a short cycle within a month, gets multiple groups of power generation operating power changes in a short cycle, and calculates the arithmetic mean of the power generation operating power at the same time point in each short cycle to obtain the average power generation operating power at each time point in a month. The peak shaving model generation unit takes the average power generation operating power as the vertical axis and 24 hours as the horizontal axis, creates a data point every set time interval on the horizontal axis, obtains the power generation operating power mean change curve, and uses the power generation operating power mean change curve as the peak shaving law model for the thermal power unit.

3. The APS wide-load automatic control system based on powder-making depth peak shaving according to claim 1, wherein, When conducting statistics on the fuel consumption, the fuel management unit conducts statistics at the same time interval as when conducting statistics on the peak shaving operation of the thermal power unit to obtain the fuel consumption between each time interval, and obtains the remaining fuel quantity at the same time interval; The fuel management unit constructs a fuel consumption curve based on the time interval and the fuel consumption, and constructs a remaining fuel quantity curve based on the time interval and the remaining fuel quantity; The fuel management unit overlays and compares the fuel consumption curve with the peak shaving law model, and obtains the ratio relationship between the power generation operating power and the fuel consumption speed through the ratio of the power generation operating power to the fuel consumption in the peak shaving law model.

4. The APS wide-load automatic control system based on peak shaving by grinding depth according to claim 1, wherein When the coal mill is operating, the pulverizing model generation unit conducts statistics on the operating load of the coal mill at the same time interval as the peak shaving operation. When the coal mill is shut down, the operating load is recorded as 0; The pulverizing model generation unit generates a pulverizing load model with time as the horizontal axis and the operating power of the coal mill as the vertical axis.

5. The APS wide-load automatic control system based on milling depth peak shaving according to claim 1, wherein The efficiency overall management unit obtains the fuel remaining amount curve and the pulverizing load model, and through the coincidence comparison of the curves in the fuel remaining amount curve and the pulverizing load model, obtains the ratio of the pulverizing load to the fuel remaining amount corresponding to each horizontal axis point, which is recorded as the pulverizing ratio.

6. The APS wide-load automatic control system based on the peak shaving of the milling depth according to claim 1, wherein, The efficiency overall management unit obtains the fuel remaining amount curve and the fuel consumption curve through the fuel management unit, and sums up the vertical axis of the fuel consumption curve and the difference between the two ends of the fuel remaining amount curve to obtain the total pulverizing amount; The efficiency overall management unit obtains the total energy consumption of the coal mill through the electric energy metering device; The efficiency overall management unit obtains the pulverizing energy efficiency through the calculation model, compares the pulverizing energy efficiency with the set energy efficiency, and generates an energy efficiency qualified signal or an energy efficiency unqualified signal according to the comparison result.

7. The APS wide-load automatic control system based on the milling depth peak regulation according to claim 1, wherein, After obtaining the energy efficiency qualified signal, the wide load prediction and adjustment unit does not perform adjustment; After obtaining the energy efficiency unqualified signal, the wide load prediction and adjustment unit analyzes the pulverizing ratio: The wide load prediction and adjustment unit obtains the preset high ratio and low ratio, and compares the pulverizing ratio with the high ratio and the low ratio respectively. If the pulverizing ratio is greater than the high ratio or less than the low ratio, it is recorded as a normal point. If the pulverizing ratio is between the high ratio and the low ratio, it is recorded as an abnormal point; The wide load prediction unit obtains the abscissa corresponding to the abnormal point, and obtains the fuel remaining amount corresponding to the abscissa through the fuel remaining amount curve. If the fuel remaining amount is greater than the set threshold, the pulverizing ratio is adjusted towards the low ratio. If the fuel remaining amount is less than or equal to the set threshold, the pulverizing ratio is adjusted towards the high ratio.

8. The APS wide-load automatic control system based on the peak shaving of powder-making depth according to claim 1, wherein The wide load prediction unit performs real-time analysis according to the peak shaving power model and the fuel remaining amount curve, and sends the analysis result to the pulverizing model generation unit to perform real-time adjustment of the pulverizing power.

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