A power-saving control strategy for reducing the total pressure applied by the primary air fan of a coal-fired power plant

The high power consumption of auxiliary equipment, particularly that of the primary air fan, in a coal-fired power plant provides ample scope for reducing power consumption. Therefore, a power-saving control strategy for the primary air fan is proposed that automatically calculates a primary air pressure offset value in real time, which, when combined with the existing primary air pressure setting, reduces the total pressure, and correspondingly decreases the power consumption of the primary air fan while maintaining the mill outlet temperature within the optimum range. The power-saving control strategy implements two models that are respectively applicable to normal conditions and mill outlet over-temperature conditions. Mechanistic modeling is implemented for the model applicable to normal conditions. The model evaluates the mill inlet hot air damper opening for determining the potential for reducing the power consumption, the mill inlet cold air damper opening is applied for adjust the mill outlet temperature, and the total pressure and corresponding power consumption are thereby reduced. The other model is controlled by a conventional proportional derivative controller, which employs the deviation of the mill outlet temperature as its input. The proposed power-saving control strategy is applied to a 1000MW commercial power plant, and the power consumption of the primary fan is demonstrated to be reduced by as much as 465kW for a 500MW load, resulting in a power consumption reduction of 15%.

[1]  Shien Hui,et al.  NOx emission and thermal efficiency of a 300 MWe utility boiler retrofitted by air staging , 2009 .

[2]  Amin Mohammadi Khoshkar Vandani,et al.  Exergy analysis and evolutionary optimization of boiler blowdown heat recovery in steam power plants , 2015 .

[3]  W. Tao,et al.  A hybrid model for explaining the short-term dynamics of energy efficiency of China’s thermal power plants , 2016 .

[4]  Roberto Carapellucci,et al.  Energy, Economic and Environmental Assessments for Gas-turbine Integration into an Existing Coal-fired Power Plant , 2014 .

[5]  Genshan Jiang,et al.  Monitoring ash fouling in power station boiler furnaces using acoustic pyrometry , 2015 .

[6]  Xi Zhang,et al.  Multivariable constrained predictive control of main steam temperature in ultra-supercritical coal-fired power unit , 2015 .

[7]  Jose A. Souto,et al.  Experimental development of CO2, SO2 and NOx emission factors for mixed lignite and subbituminous coal-fired power plant , 2013 .

[8]  Paulo Novais,et al.  Design of Posicast PID control systems using a gravitational search algorithm , 2015, Neurocomputing.

[9]  Ramesh C. Bansal,et al.  Integrating multi-objective optimization with computational fluid dynamics to optimize boiler combustion process of a coal fired power plant , 2014 .

[10]  Jingcheng Wang,et al.  On-line monitoring of ash fouling and soot-blowing optimization for convective heat exchanger in coal-fired power plant boiler , 2015 .

[11]  Carlos Platero,et al.  Multicriteria optimization of the investment in the auxiliary services of thermal power plants: A case study , 2015 .

[12]  Roberto Carapellucci,et al.  Upgrading existing coal-fired power plants through heavy-duty and aeroderivative gas turbines , 2015 .

[13]  Chunxi Li,et al.  Numerical investigation of blade tip grooving effect on performance and dynamics of an axial flow fan , 2015 .

[14]  Rajesh N. Patel,et al.  Optimization of Auxiliary Power Consumption of Combined Cycle Power Plant , 2013 .

[15]  Rubén Saborido,et al.  A combined interactive procedure using preference-based evolutionary multiobjective optimization. Application to the efficiency improvement of the auxiliary services of power plants , 2015, Expert Syst. Appl..

[16]  Edward J. Anthony,et al.  Clean combustion of solid fuels , 2008 .

[17]  Anna Skorek-Osikowska,et al.  An analysis of the investment risk related to the integration of a supercritical coal-fired combined heat and power plant with an absorption installation for CO2 separation , 2015 .

[18]  Xiaoqian Ma,et al.  NOx and SO2 emissions from municipal solid waste (MSW) combustion in CO2/O2 atmosphere , 2012 .

[19]  Vladimir I. Kuprianov,et al.  Experimental study on effects of operating conditions and fuel quality on thermal efficiency and emission performance of a 300-MW boiler unit firing Thai lignite , 2007 .

[20]  Jan Szargut,et al.  Comparison of the efficiency of the variants of a primary gas turbine supplementing a coal-fired power plant , 2005 .

[21]  Moses O. Tadé,et al.  Rate-based modelling of combined SO2 removal and NH3 recycling integrated with an aqueous NH3-based CO2 capture process , 2015 .

[22]  Ming-Jia Li,et al.  A data envelopment analysis for energy efficiency of coal-fired power units in China , 2015 .

[23]  Gang Xu,et al.  Comprehensive exergy-based evaluation and parametric study of a coal-fired ultra-supercritical power plant , 2013 .

[24]  Udaykumar R. Yaragatti,et al.  Control of CO2 emission through enhancing energy efficiency of auxiliary power equipment in thermal power plant , 2014 .

[25]  J. I. Inayat-Hussain,et al.  Simulating the implications of oxide scale formations in austenitic steels of ultra-supercritical fossil power plants , 2014 .