Coal conveying control system and method for thermal power plant

A coal conveying control method for a thermal power plant, performed by a computer device, and comprising:

• obtaining current boiler working parameters by sensors arranged in a boiler, building an operating load prediction model, and obtaining a boiler operating load optimal value according to the operating load prediction model;
• obtaining a boiler operating load measured value by the sensors, drawing an operating load difference value curve according to the boiler operating load measured value, and determining a boiler coal consumption change amount according to the operating load difference value curve;
• determining a coal conveying amount of a coal conveying system according to the boiler coal consumption change amount, and controlling operating speed of a coal conveying belt in the coal conveying system according to the coal conveying amount;
• calculating boiler operating efficiency according to the operating speed, and determining a coal quality parameter according to the boiler operating efficiency;
• determining a coal particle parameter according to the coal quality parameter, setting target coal particle fineness according to the coal particle parameter, and controlling a screening and crushing device in the coal conveying system according to the target coal particle fineness;
• wherein obtaining a boiler operating load optimal value according to the operating load prediction model comprises:
• obtaining historical boiler working parameters and corresponding historical operating load data by the sensors, and preprocessing the historical boiler working parameters and corresponding historical operating load data;
• building a data set according to preprocessed historical boiler working parameters and corresponding historical operating load data, and building the operating load prediction model according to the data set;
• training the operating load prediction model according to the data set, obtaining a final operating load prediction model;
• inputting the current boiler working parameters into the final operating load prediction model, obtaining the boiler operating load optimal value;
• wherein obtaining a boiler operating load measured value, drawing an operating load difference value curve according to the boiler operating load measured value, and determining a boiler coal consumption change amount according to the operating load difference value curve comprise:
• calculating a difference value between the boiler operating load measured value and the optimal value, and drawing the operating load difference value curve according to a change trend of the difference value between the boiler operating load measured value and the optimal value with time;
• determining an average value of the operating load difference value in a preset time period according to the operating load difference value curve, and in response to determining that the average value of the operating load difference value in the preset time period is less than a first preset threshold value, setting the boiler coal consumption change amount to zero;
• in response to determining that the average value of the operating load difference value in the preset time period is greater than or equal to the first preset threshold value, setting a boiler coal consumption change amount standard value, calculating a ratio of the average value of the operating load difference value in the preset time period to a preset standard average value, obtaining a boiler coal consumption change amount correction value;
• multiplying the boiler coal consumption change amount correction value with the boiler coal consumption change amount standard value, obtaining the boiler coal consumption change amount in the preset time period;
• wherein calculating boiler operating efficiency according to the operating speed, and determining a coal quality parameter according to the boiler operating efficiency comprise:
• determining an actual coal conveying amount in the preset time period according to conveying speed of the coal conveying belt in the preset time period, and calculating a boiler operating efficiency optimal value corresponding to the actual coal conveying amount according to boiler coal type information;
• obtaining a boiler operating efficiency measured value in the preset time period, calculating a difference value between the boiler operating efficiency optimal value and the measured value, and obtaining an operating efficiency difference value;
• calculating a ratio between the operating efficiency difference value and a preset standard operating efficiency difference value, and normalizing the ratio between the operating efficiency difference value and the preset standard operating efficiency difference value, obtaining the coal quality parameter;
• wherein determining a coal particle parameter according to the coal quality parameter comprises:
• substituting the coal quality parameter into a coal particle parameter calculation formula, obtaining the coal particle parameter, wherein the coal particle parameter calculation formula specifically is:
• Rs=Rα exp(Qs)
• wherein Rs is the coal particle parameter, Rα is a preset standard coal particle parameter, exp is a natural exponential function, and Qs is a coal quality parameter;
• wherein setting target coal particle fineness according to the coal particle parameter comprises:
• determining a coal particle fineness correction value according to a difference value between the coal particle parameter and the preset standard coal particle parameter, and in response to determining that the difference value between the coal particle parameter and the preset standard coal particle parameter is greater than a second preset threshold, setting a first correction value as the coal particle fineness correction value;
• in response to determining that the difference value between the coal particle parameter and the preset standard coal particle parameter is less than or equal to the second preset threshold, setting a second correction value as the coal particle fineness correction value;
• in response to determining that the difference value between the coal particle parameter and the preset standard coal particle parameter is less than a third preset threshold, setting a third correction value as the coal particle fineness correction value;
• wherein determining a coal conveying amount of a coal conveying system according to the boiler coal consumption change amount, and controlling operating speed of a coal conveying belt in the coal conveying system according to the coal conveying amount, comprises:
• determining a boiler coal consumption amount in the preset time period according to the boiler coal consumption change amount, and determining a target coal conveying amount of the coal conveying belt in the preset time period according to the boiler coal consumption amount in the preset time period;
• dividing the preset time period into a plurality of sub-periods, and setting a maximum allowable cross-sectional area of the coal conveying belt in each of the sub-periods according to the target coal conveying amount in the preset time period;
• obtaining a current cross-sectional area of the coal conveying belt, calculating a ratio of the current cross-sectional area to the maximum allowable cross-sectional area, and obtaining full load rate of the coal conveying belt;
• controlling the conveying speed of the coal conveying belt according to the full load rate of the coal conveying belt.