Under the premise of optimizing the running mode of the steam turbine constant sliding pressure,from the perspective of the whole boiler system,the theoretical model to simulate detailed behavior of the boiler itself based on the principle of single parameter variation was established.The energy balance equations considering the heat absorption of working fluid and heat release of flue gas were satisfied to investigate the influence of pressure variation of main steam on boiler efficiency.The results show that increasing main steam pressure can lead to a reduction in the temperature of flue gas,and consequently,a decline in exhaust heat loss.The temperature decrease of flue gas will also result in a drop of heat loss due to extraction of boiler slag,however,the influence tends to be very limited.In addition,the latent heat reduces in accordance with the increase of main steam pressure,which further contributes to the rise of temperature in the furnace,the combustion of pulverized coal,the content of combustible materials in fly ash,and the improvement of combustion efficiency.By optimizing the operating pressure,the overall economy of the unit is improved.
main steam pressureboiler thermal efficiencyflue gas temperatureexhaust heat losscombustible in fly ash
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