Research on Feed Water Control of DC Boiler Based on Self-optimization of Water Fuel Ratio
The article takes the direct current boiler of supercritical thermal power unit as the research object and propose a water fuel ratio(WFR)setting curve to solve the imbalance of boiler water fuel ratio due to the difference in calorific value between the actual coal and the designed coal.The strategy uses the historical operation data and real-time load of the unit to establish a self-optimi-zation model of water fuel ratio and dynamically calculates and obtains water fuel ratio coefficient to balance water and fuel.The strategy is applied to a 350 MW supercritical unit in Shaanxi Province,the results show that the calibration water volume at the in-termediate point of the unit decreased from 200 t/h to less than 50 t/h,the main steam pressure deviation decreased from 2 MPa to 1 MPa,and the steam overtemperature frequency decreased from 11 times per month to 2 times.
supercritical thermal power unitswater fuel ratioself-optimizationcoordination control systemfeed water control
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