Method for calculating flue gas flow of coal-fired boiler in heat-engine plant and method for controlling pollutant discharge amount

Abstract

The invention discloses a method for calculating the flue gas flow of a coal-fired boiler in a heat-engine plant and a method for controlling pollutant discharge amount. The calculation method comprises the following steps: calculating the amount of dry flue gas generated by unit mass as-fired coal in the coal-fired boiler in the heat-engine plant; calculating the lower heating value of the as-fired coal; calculating the standard unit time coal consumption of the coal-fired boiler in the heat-engine plant; calculating the consumption of unit time as-fired coal in the coal-fired boiler in the heat-engine plant; calculating the flue gas flow of the coal-fired boiler. The control method comprises the following steps: calculating the pollutant discharge amount of a generator set in the heat-engine plant within a statistic time interval according to the flue gas flow of the coal-fired boiler in unit time, and comparing the pollutant discharge amount with a standard pollutant discharge amount; if the pollutant discharge amount of the coal-fired boiler is lower than the standard pollutant discharge amount, discharging flue gas; if the pollutant discharge amount of the generator set is higher than the standard pollutant discharge amount, controlling the pollutant discharge amount till the pollutant discharge amount is lower than the standard pollutant discharge amount. By adopting the calculation method, the amount of flue gas generated in the burning process of the coal-fired boiler in the heat-engine plant can be calculated more accurately, and the discharge amount of SO2, NOx and dust can be calculated more accurately.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for calculating the flue gas flow rate of a coal-fired boiler in a thermal power plant and a method for controlling the emission of pollutants. Background technique [0002] Due to the large variation range of the power supply load of coal-fired power plants, and the frequent changes of the type of coal used, the large cross-sectional area of ​​the boiler flue and the uneven distribution of the flow field, which varies greatly with the load, the flow measurement point error in the existing daily operation process is too large. Big. The measurement error of real-time online flue gas flow measurement points is too large, and there is no relevant standard and method to calculate the real-time flue gas flow of thermal power plant boilers during normal operation. Therefore, there is a need for a more accurate method of determining the flue gas flow rate of an ope...

AI Technical Summary

Problems solved by technology

[0003] The traditional on-line monitoring method of pollutant emissions generally uses direct measurement of flue gas flow with a relatively large error (generally up to 30%). have large deviation

At the same time, the traditional off-line calculation of pollutant emissions requires comprehensive calculation of power plant coal consumption, coal sulfur content and desulfurization efficiency information. The accuracy of calculation is closely related to the accuracy of the above indicators, and generally there are large errors, which directly affect Calculation Accuracy of Pollutant Emissions in Power Plants

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