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Coal supply method of optimizing fire power plant by real-time coal firing heat value coefficient

A technology of coal-fired calorific value and coefficient, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as large differences in heat, no practical value, and no published patent documents.

Active Publication Date: 2013-09-18
STATE GRID TIANJIN ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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
By searching, there is no published patent document similar to the method of the present invention at present

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  • Coal supply method of optimizing fire power plant by real-time coal firing heat value coefficient

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Experimental program
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Embodiment 1

[0024] The specific embodiments of the present invention will be further detailed below in conjunction with the drawings

[0025] A method for optimizing coal supply for thermal power plants using real-time coal-fired calorific value coefficients, the specific steps are as follows:

[0026] ⑴Determine the time interval: when the generator set is stable, take a certain moment as the starting point of timing 0, take the time t as the end of timing, and determine the time period t as the time period for calculating the comprehensive coefficient of coal heating value;

[0027] ⑵Continuously record variable values ​​in time period t: Record three variables of power MW, fuel quantity T, and drum pressure P of the generator set in real time after stable operation, and draw the variable curve in time period t;

[0028] ⑶ Derive the fuel quantity per unit power in the time period t: first add up the real-time power MW of the generator set, the fuel quantity T, and the total amount in the time p...

Embodiment 2

[0038] In this embodiment, the conversion constant C between pressure and coal quality is calculated; C=(C 0 -P t ) / (C 0 -P 0 ), where P 0 , P t The pressure value of can be replaced by the main steam pressure value for the generator set drum pressure value. Because the change of main steam pressure is similar to that of generator set drum pressure, the difference between the two calculations can be ignored.

[0039] Therefore, the pressure correction constant C in this embodiment 0 The test can also be obtained through the main steam pressure value instead of the generator set drum pressure value:

[0040] ⑴ The initial conditions of the measurement test are: the power generation load of the generator set is 250MW, the main steam pressure is 16MPa, the operating fuel quantity of the generator set is 125 tons / hour, and the coal quality remains unchanged during the test;

[0041] (2) The termination conditions of the measurement test are: the power generation load of the generator set...

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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 of the 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 for thermal power stations by using real-time coal-fired heating value coefficients. Background technique [0002] Coal quality for generating units is an important parameter that all thermal power plants need to monitor in real time, but currently only the online coal quality analyzer can be used, which can provide reference calorific value and coal composition, but it is useful for realizing 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 the furnace in time, this result cannot be used in the actual unit peak and frequency modulation. The practical value is limited, so many experts are in Research on the online ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/02
Inventor 赵毅黄靖宁
Owner STATE GRID TIANJIN ELECTRIC POWER
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