Coal supply method of optimizing fire power plant by real-time coal firing heat value coefficient
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A coal-fired calorific value and coefficient technology, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as inaccurate calculations, irregularities, and large differences in heat
Active Publication Date: 2012-09-12
STATE GRID TIANJIN ELECTRIC POWER +1
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However, there are various kinds of coal coming from all power plants, and the calorific value of each coal quality varies greatly, resulting in frequent and irregular changes in the calorific value of the fuel entering the unit. If the coal quality is calculated by conventional methods, it can only be calculated during the stable period of the unit. practical value, but the calculation during the unit lifting and lowering load can only be a rough calculation, but not accurate calculation, and the final result has no practical value
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Embodiment 1
[0026] A method for optimizing the coal supply of thermal power plants by using real-time coal-fired calorific value coefficients, the specific steps are as follows:
[0027] (1) Determining the time interval: when the generator set works stably, take a certain moment as the timing start point 0, take t time as the timing end point, and determine the period t as the period for calculating the comprehensive coefficient of coal-fired calorific value;
[0028] (2) Continuously record the variable values in the period t: record the three variables of power MW, fuel volume T, and steam drum pressure P of the generator set in real time after the stable operation, and draw the variable curve in the period t;
[0029] (3) Deriving the fuel quantity per unit power within the time period t: First, add up the real-time power MW of the generator set, the fuel quantity T, and the total amount within the time period t, that is, A=∫ 0 t MW and B=∫ 0 t T, and then get the fuel quantity Q...
Embodiment 2
[0039] Calculate the conversion constant C of pressure and coal quality in the present embodiment; C=(C 0 -P t ) / (C 0 -P 0 ), where P 0 ,P t The pressure value of the generator set can be replaced by the main steam pressure value. Because the variation of the main steam pressure is similar to that of the steam drum pressure of the generator set, the deviation between the two calculations can be ignored.
[0040] Therefore, in this embodiment, the pressure correction constant C 0 The test can also be obtained by replacing the steam drum pressure value of the generator set with the main steam pressure value:
[0041](1) The initial conditions of the determination test are: the power generation load of the generator set is 250MW, the main steam pressure is 16MPa, the operating fuel volume of the generator set is 125 tons / hour, and the coal quality remains unchanged during the test;
[0042] (2) The termination conditions of the measurement test are: the power generation lo...
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Abstract
The invention relates to a coal supply method of optimizing a fire power plant by real-time coal firing heat value coefficient. The method includes monitoring various main parameters of a running unit in a certain time, multiplying and dividing relevant variable integral to obtain a dimensionless coefficient which can directly indicate relative capacity of real-time coal-fired heating quantity ofthe unit and provide operation basis for adjustment and control of an automatic power generation unit. By the coal supply method, an expensive coal-quality online analyzer can be substituted, online computing of real-time coal-fired heating quantity of the power generation unit is realized, and a coat-fired heating value coefficient is obtained. The coat-fired heating value coefficient can indicate data relation between real-time coal-fired heating quantity and designed value, which on one hand, can provide running references for monitors and can provide important operation data for an automatic power generation control system on the other hand. The coal supply method realizes real-time load adjustment of the unit and provides important insurance for safe and stable running of the unit and high-efficient peak pitching and frequency modulation of the power grid.
Description
technical field [0001] The invention belongs to the technical field of automatic power generation control of power generation system units, and specifically relates to a method for optimizing coal supply in thermal power stations by using real-time coal-fired calorific value coefficients. Background technique [0002] Coal quality is an important parameter that all thermal power plants need to monitor in real time, but currently only the coal quality online analyzer can be used, which can provide reference calorific value and coal composition, but it is very important for automatic power generation control (AGC) As far as the coordinated control system is concerned, it can only provide a reference for the operators. Because the test results cannot reflect the current coal quality in time, the results cannot be used in the peak and frequency regulation of the actual unit. The practical value is limited, so many experts are in Research on the online calculation method of coal ...
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