Real-time estimation method for flue gas energy of hearth outlet of thermal power generating unit boiler

Abstract

The invention provides a real-time estimation method for the flue gas energy of a hearth outlet of a thermal power generating unit boiler. The method particularly comprises the steps that 1, according to the running design discipline of the boiler, a main equipment structure parameter data bank is built, and related real-time data are read from a real-time data bank of a plant-level monitoring information system; 2, according to a working medium physical property parameter bank and a flue gas physical property parameter bank, the information of a server of the plant-level monitoring information system is combined to compute the physical property parameters of the working medium on the aerated water side and the flue gas on the wind-smoke side under the given time in a real-time mode; 3, the energy Qyq of the flue gas of the hearth outlet is obtained through a heat exchanger working medium quality and energy dynamic balance model and an exhaust gas heat loss model. The method is used for online estimation of the flue gas energy of the hearth outlet, and can also be used for online recognition of the average flue gas temperature of the hearth outlet and the as-fired coal heat value and online estimation of boiler efficiency and the like.

Description

technical field [0001] The invention relates to a method for estimating the energy of high-temperature flue gas at the furnace outlet of a thermal power unit boiler in the field of thermal power generation control, in particular to a method for real-time estimation of the flue gas energy at the furnace outlet of a thermal power unit boiler based on mechanism modeling. Background technique [0002] The main method of measuring the flue gas energy at the boiler furnace outlet of the thermal power unit is to directly install the corresponding hardware measuring point (usually a thermocouple temperature sensor) at the corresponding position, and the signal of the measuring point is converted into a digital signal through digital-to-analog conversion. Gain smoke energy. [0003] However, the flue gas flow field at the furnace outlet is complex, and the temperature at the same cross-section is unevenly distributed, so the temperature measured by a limited number (usually one or tw...

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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.) In fact, the material and physical parameters 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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