Method for measuring boiler thermal efficiency of coal fired power plant in real time

Abstract

The invention provides a method for measuring boiler thermal efficiency of a coal fired power plant in real time. The method comprises the following steps: step 1, obtaining boiler structure parameters according to the boiler operation design discipline, and reading a real-time value of an operation working condition measuring point at a set moment from the real-time database of a DCS (Distributed Control System); step 2, calculating the specific enthalpy and density of a working medium and the specific heat and density of fume according to a working medium physical property parameter library and a fume physical property parameter library; step 3, respectively determining the energy output of each part on the boiler side and the total energy output at the set moment according to an vaporization system model, a heat exchanger system (including a superheater system and a reheater system) model and a heat loss model on the boiler side; Step 4, determining the boiler thermal efficiency. The method can be used for measuring the boiler thermal efficiency in an online manner and further providing a technical support for plant-level load scheduling.

Description

technical field [0001] The invention relates to a real-time measurement method of boiler thermal efficiency in the field of thermal power generation control, in particular to a real-time measurement method of boiler thermal efficiency based on a boiler side mechanism model and DCS real-time data in a coal-fired power station. 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. Boilers are places where coal-fired chemical energy releases heat energy, and are also the main equipment for pollutant emissions in coal-fired power stations. Therefore, boiler combustion optimization to achieve energy conservation and emission reduction has always been a key research direction in the field of thermal power. Boiler thermal efficiency is an important performance indicator for boiler combustion optimization. It is of great significance to monitor the c...

AI Technical Summary

Problems solved by technology

This method first needs to establish a coal quality database, and assumes that there is a one-to-one correspondence between coal quality and element components, which is difficult to establish in practice due to the instability of coal types in power stations; in addition, the iterative method is time-consuming and difficult Realize online real-time measurement of boiler thermal efficiency

Images