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Coal-fired power station boiler reheater working medium flow online correction method

A technology of a coal-fired power station and a correction method, which is applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, volume change compensation/correction device, etc., can solve problems that have not been considered, and achieve improved accuracy and good versatility And robustness, good effect of dynamic characteristics

Inactive Publication Date: 2019-01-04
ZHONGBEI UNIV
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  • Claims
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Problems solved by technology

However, this method focuses on the distribution of the flow of the superheater and reheater, and does not take into account the influence of factors such as the exhaust of the reheater reheating system on the flow of the working fluid, which has certain limitations for higher precision requirements

Method used

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  • Coal-fired power station boiler reheater working medium flow online correction method
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  • Coal-fired power station boiler reheater working medium flow online correction method

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0050] First of all, the following examples need to be explained: the boiler in this example is HG-1025 / 17.3-WM18 type, the boiler load is 300MW, the boiler adopts subcritical, natural circulation, one intermediate reheating, double arch single furnace, "W" Flame combustion method, double flue at the rear, flue gas baffle temperature adjustment, balanced ventilation, solid slag discharge, open-air layout, all-steel frame suspension drum furnace.

[0051] The external heat flow of the reheater and recuperator system is considered to be evenly distributed along the tube length and circumference; the tube wall metal of the heat exchanger is only considered for radial heat transfer; the working medium in the tube is inco...

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Abstract

The invention discloses a coal-fired power station boiler reheater working medium flow online correction method. The method comprises the following steps: acquiring related boiler running data in realtime from an engineer station in a boiler distributed control system (DCS) after selecting fixed sampling time; establishing a working medium physical property parameter library for online computation of water and vapor enthalpy values; setting a design parameter of a boiler related superheater system according to boiler design drawing; performing dead pixel processing and data smoothing processing on the collected running parameter of the boiler; establishing a boiler reheating system working medium mass and energy balancing equation based on mass and energy balancing; modifying an energy balancing equation in the step 4 according to heat storage change of a working medium and a metal heat-absorbing surface under the temperature pressure change; obtaining temperature, pressure and flow at each measurement point of the reheater system from the measurement point, and obtaining the temperature, pressure and flow related data of the working medium; simultaneously acquiring exhaust volumes of the primary exhaust and the secondary exhaust by combining the corrected mass and energy balancing equation; and finally obtaining the corrected reheater working medium flow.

Description

technical field [0001] The invention relates to the technical field of electric power and information processing, in particular to a method for on-line correction of working fluid flow in a reheater of a coal-fired power station boiler. Background technique [0002] my country's power supply is dominated by coal-fired power generation, and this situation is expected to not change for a long time. Therefore, as energy saving and emission reduction are getting more and more attention today, how to tap the potential of energy saving and emission reduction of coal-fired power plants on the basis of ensuring safe production is a problem that needs to be solved. The boiler is one of the three core equipments of coal-fired power generation enterprises, and it is also the key object of energy conservation and emission reduction of the entire power station. Optimal control of the coal-fired power generation process is one of the important means to achieve energy conservation and emi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/00G01F15/00G01F15/02
CPCG01F1/00G01F15/00G01F15/02
Inventor 史元浩崔方舒温杰庞晓琼贾建芳曾建潮
Owner ZHONGBEI UNIV
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