Study The Influence Of Coal Quality On Thermal Economy Of Coal-fired Generating Unit

At present,most of power plant boiler burning mixed coal,so it is difficult to ensure the quality of coal,and sometimes far from the design of coal,and the quality of coal is essential to the thermal economy of thermal power plant.Therefore,it is significant to study the influence of changing coal quality on the thermal economy of thermal power plant,and to provide reference for thermal power plant to choose coal quality.Firstly,the paper introduces the ASME PTC and GB PTC boiler efficiency calculation standards,analyzes and compares them.And the thermal efficiency calculation model of the boiler is established based on the two standards.According to the traditional analysis method and the unit consumption analysis method,the boiler exergy efficiency calculation model is established.The boiler exergy efficiency is calculated by the positive balance method,and the loss of the boiler inner and outer is calculated and analyzed.Boiler efficiency is to characterize the boiler's economic operation of the main integrated technical indicators.In order to select an economic coal,the thermal efficiency of coal must be calculated accurately.Taking Yungang 300 MW subcritical boiler as an example,the calculation and analysis of boiler efficiency,thermal efficiency,fan power consumption and power consumption of coal mill were carried out respectively.The effects of different coal types on the boiler efficiency and auxiliary power consumption were also analyzed.The influence of single coal composition on boiler efficiency and auxiliary power consumption was also calculated and analyzed.Based on the mathematical model established in Chapter 2,the off-line analysis and calculation software of large-scale power plant boiler efficiency is developed by using MATLAB programming software.The software can be used to calculate the boiler efficiency and auxiliary power consumption,and can analyze and compare the efficiency of different coal boiler efficiency and auxiliary power consumption,and to provide the basis for the thermal power plant coal quality selection.