Real-time identification method for fired coal lower heating value of coal-fired power plant

Abstract

The invention provides a real-time identification method for a fired coal lower heating value of a coal-fired power plant. The real-time identification method includes the steps of (1) obtaining boiler structure parameters according to a boiler operation design discipline, and reading an operation condition measurement point real-time value at the given moment from a real-time database of a DSC, (2) calculating the specific enthalpy and the density of working media and the specific heat and the density of smoke based on a working medium physical property parameter base and a smoke physical property parameter base, (3) correcting main steam flow masses based on a relation model of main steam adjustment door opening degrees and the main steam flow masses, (4) respectively calculating corresponding energy output of various parts on the boiler side and total energy output at the given moment according to a boiler-side complete-flow-path mechanism model, (5) building a transfer function model between coal feeding flow masses of a coal feeder and the fired coal flow masses, and (6) building a transfer function model between the fired coal flow masses and the total energy output. The real-time identification method is used for on-line identification on the fired coal lower heating value, and has the application potential of combustion and coal blending optimization.

Description

technical field [0001] The present invention relates to a method for real-time identification of low-level calorific value of furnace-infused coal in the field of thermal power generation control, in particular to a real-time identification method for low-level calorific value of furnace-infused coal based on a power plant boiler side mechanism model and DCS real-time data. Background technique [0002] Coal-fired thermal power plants are the main body of my country's electric power industry and also a key area of ​​energy conservation and emission reduction. Due to the diversification of coal mining, transportation, and coal prices in my country, most power plants are faced with the bottleneck problem of frequent fluctuations in the quality of incoming coal, which affects the safe and efficient operation of the entire process. An important index to measure coal quality is low calorific value, which is defined as the heat that can be produced by the complete combustion of co...

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Problems solved by technology

Thermo Electron (now known as Thermo Fisher Scientific Inc.) has developed a coal-feeding elemental analyzer based on PGNAA-Prompt Gamma Neutron Activation Analysis, which calculates real-time low-level calorific value through software, but it involves radioactive sources In addition, the product price and long-term maintenance cost are relatively high, and it is far from being popularized and applied in China

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