Method for detecting average temperature of hearth outlet smoke of coal-fired power plant in real time

Abstract

The invention provides a method for detecting the average temperature of hearth outlet smoke of a coal-fired power plant in real time. The method comprises the specific steps of 1 establishing a main device structure parameter database according to boiler operation design discipline and reading relevant real-time data from a real-time database of a plant-level supervisory information system; 2 calculating a given-moment steam-water-side working medium and wind-smoke-side smoke physical property parameters according to a working medium physical property parameter library, a smoke physical property parameter library and server information of the plant-level supervisory information system in a field in real time; 3 obtaining energy Qyq of the hearth outlet smoke through a heat exchanger working medium quality and energy dynamic balancing model and an exhaust smoke heat loss model; 4 establishing an ideal gas enthalpy calculating model and confirming the average temperature Tyq of the hearth outlet smoke in real time. The average temperature of the hearth outlet smoke is an important characteristic of the combustion condition, can be used for combustion state monitoring and low-nitrogen combustion optimal control and can be used for on-line identification of a coal-fired heat value and on-line estimation of boiler efficiency and the like.

Description

technical field [0001] The invention relates to a method for detecting the average temperature of high-temperature flue gas at the furnace outlet of a coal-fired power station, specifically, a real-time detection method for the average temperature of high-temperature flue gas based on steam-water measurement of working medium quality and energy dynamic balance. It belongs to the field of thermal power generation control. Background technique [0002] The main method of measuring the average temperature of flue gas at the furnace outlet of coal-fired power plants is to directly install temperature measuring elements (usually thermocouple temperature sensors) at the corresponding positions, and the signals of the measuring points are converted into digital signals through digital-to-analog conversion and uploaded to the server of the plant-level monitoring information system. to the monitoring interface. [0003] However, the flue gas flow field at the furnace outlet is compl...

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Problems solved by technology

However, this method assumes that the key physical parameters of the working medium (density, enthalpy, etc.) and the structural parameters of the main equipment (pipe diameter, pipe length, arrangement, etc.) The physical parameters of the working fluid actually change with the load), and it is not suitable for units with different structures and different powers of heat exchange equipment

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