Synchronous reckoning method of utility boiler efficiency and coal heat value as well as ash content and moisture content

Abstract

The invention relates to a synchronous reckoning method of utility boiler efficiency and coal heat value as well as ash content and moisture content, wherein air supply temperature, smoke exhaust temperature, smoke exhaust oxygen content, carbon content in fly ash, boiler-fed fuel content, boiler evaporation amount, assembly electric generating load, main steam pressure temperature, reheated steam inlet/outlet pressure temperature, water supply pressure temperature and flow rate, steam drum pressure, reheater temperature lowering water jet amount and steam extraction pressure temperature of each heater of high pressure cylinder are read through a plant-level supervisory information system (SIS) of a thermal power plant; and the parameters as the water temperature and drainage temperature of the inlet/outlets of different-level heaters of the high pressure cylinder are synchronously reckoned by hypothesizing the initial values of the coal heat value, the coal ash content and the coal moisture content, utilizing a boiler anti-balance heat efficiency model, a dry air amount required for theoretical combustion and actual smoke quality simplified calculating model, an actual smoke quality calculating model, an actual smoke volume calculating model, an actual smoke amount calculating model, a boiler positive-balance heat efficiency model and a boiler effective utilized heat model, and establishing prediction and rectification methods.

Description

technical field [0001] The invention relates to a method for synchronously measuring and calculating the thermal efficiency of a power plant boiler and coal calorific value, ash content and moisture, which can realize the synchronous measurement and calculation of the thermal efficiency of the power plant boiler and the coal calorific value, ash content and moisture, and belongs to the field of soft measurement. Background technique [0002] At present, the monitoring of coal calorific value, ash and moisture in power plants is mainly obtained through offline sampling and testing. In the industrial analysis of the above-mentioned coal composition, due to sampling and sample preparation errors and analysis time lag, it cannot reflect the fuel in the boiler at the time of calculation. Therefore, how to calculate the coal calorific value, ash content and moisture and their changes that can reflect the boiler heat balance effect online, and calculate the boiler efficiency simulta...

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Problems solved by technology

[0005] Chinese patent 02110116.7 discloses a method for real-time monitoring of coal quality in the furnace. The method utilizes flue gas component analysis, heat balance equation of coal mill, combustion chemical equation, and empirical equation of correlation between the contents of various coal elements to iteratively solve each The element composition is dry and ash-free, and the real-time monitoring of the element composition and calorific value of coal combustion is realized through the Mendeleev formula. At the same time, it is applied to a 300MW power generation unit and has achieved good results. There are too many measurement variables, the solution process is relatively complicated, and the correlation between the contents of individual elements is obtained through the statistical analysis of some typical coal qualities, which has certain limitations.

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