A method for correcting detection data of coal consumption in power supply of generator set

Abstract

The invention discloses a generator set power supply coal consumption detection data correction method. In the daily coal consumption detection of a power plant, the unit coal consumption, the coal calorific value and other parameters are relatively low in detection accuracy, the single-day power supply coal consumption detection data error is relatively large, and sometimes, even completely deviates from the reasonable coal consumption state of the unit, so that the single-day power supply coal consumption detection is meaningless. According to the method, design characteristics of main equipment such as a boiler and a steam turbine are fused; a small amount of more accurate coal consumption test data and the precision of measurement parameters are obtained. According to the power supplycoal consumption detection data correction method, measurement data with remarkable errors can be corrected to the most possible value, the detection precision of power supply coal consumption after correction is remarkably improved, and the coal consumption state of a unit is accurately reflected according to the change of loads. According to the method, only a small amount of power supply coal consumption test needs to be carried out on the unit, so that the test cost is reduced, the power supply coal consumption detection precision is improved, and the actual power production requirement ismet.

Description

technical field [0001] The invention relates to the technical field of operation monitoring of a thermal power generating set, in particular to a method for correcting detection data of coal consumption for power supply of a generating set. Background technique [0002] Coal consumption for power supply is the quality of standard coal consumed by a power plant to produce 1kWh of electric energy. It is an important parameter to measure the economical efficiency of generating units, and it is also one of the most difficult indicators to detect. The coal consumption for power supply of the unit can be obtained through thermal tests, but the thermal test requires the unit to operate under specific working conditions and environments, and the test results are usually used as the basis for equipment performance assessment, rather than the true level of coal consumption for power supply in actual production. At present, the coal consumption of power supply in the actual operation o...

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Problems solved by technology

At present, the coal consumption of power supply in the actual operation of the unit generally comes from the daily coal consumption detection of the power plant. By measuring the power generation, electricity consumption, coal consumption and coal calorific value of the unit in a detection cycle, the coal consumption of power supply of the unit is obtained by using the positive balance method; the power generation and The measurement accuracy of electricity consumption is high, but there is usually a raw coal bunker between the coal consumption measurement point and the furnace, and the change of the amount of coal stored in the raw coal bunker is difficult to accurately measure. The greater the impact of the data, the lower the detection accuracy of coal consumption; the coal calorific value has not been widely measured online at present, and can only be obtained by collecting sample coal on site and conducting laboratory analysis in the chemical laboratory; the daily coal consumption of large-capacity generating units However, among the samples collected every day, the amount of sample coal finally used for laboratory analysis in the laboratory is only about a few hundred grams. Therefore, the detection data of a small amount of sample coal is used to represent the coal calorific value within the detection period , there is a large error

[0003] In order to reduce the measurement uncertainty of coal consumption and coal calorific value, a longer detection period is usually adopted in daily power supply coal consumption detection to reduce the impact of changes in coal storage in raw coal bunkers on coal consumption measurement, and multiple sampling tests are used. The average calorific value of the sample coal represents the coal calorific value within the detection period; at present, the daily coal consumption detection cycle of power plants is more than 1 day, and the practice of power production shows that when 1 day is used as the detection cycle, the coal consumption detection data of the unit power supply fluctuates greatly, and there are significant detection error, sometimes even completely deviates from the reasonable state of power supply coal consumption of the unit, making the detection of power supply coal consumption meaningless

In order to improve the accuracy of coal consumption detection, it is necessary to adopt a longer detection cycle, and to correct the detection results of coal consumption for power supply based on the coal profit and loss data obtained from coal mining in the coal yard, but the longer the detection cycle, the greater the time lag; currently The analysis of economic activities of power plants is usually based on the detection data of single-day coal consumption, and there is an urgent need for detection data of single-day coal consumption. Therefore, how to improve the accuracy of detection data of single-day coal consumption is a matter of great concern in the actual production of power plants

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