On-line fouling monitoring model of condenser in coal-fired power plants

Abstract The fouling of water side surfaces decreases the thermal effectiveness of the condenser and it is always one of operational focuses in coal-fired power plants. This study presents a comprehensive approach to realize the on-line fouling monitoring for the condenser in thermal power plants. Based on the operational mechanism and the coupling property, an all-condition mechanism model (ACMM) of coal-fired power plants is proposed to simulate coupling operating characters of systems. The simulation results of a 600 MW/16.7 MPa/560 °C/560 °C supercritical coal-fired power plant indicate that the model is of sufficient accuracy for performance calculations under different off-design conditions. An on-line fouling model of the condenser is presented according to simulation results of ACMM and on-line monitoring parameters from SIS system. For the fouling model, a correction as a function of the non-condensable gas is implemented to improve the accuracy of the condensation heat transfer resistance in the steam side of the condenser. The results of the on-line fouling monitoring in the field reveal that the fouling of the condenser increased with time and the fouling growth rates kept relative stable. Furthermore, this study also provided an alarm for the leakage fault in the condenser according to the abnormal fouling resistance tend.

[1]  Deng Shiming,et al.  Experimental performance evaluation of a novel dry-expansion evaporator with defouling function in a wastewater source heat pump , 2012 .

[2]  Xinlei Wang,et al.  Fouling of enhanced tubes for condensers used in cooling tower systems: A literature review , 2015 .

[3]  Mo Yang,et al.  A virtual condenser fouling sensor for chillers , 2012 .

[4]  Sylvain Lalot,et al.  Detection of fouling in a cross-flow heat exchanger using a neural network based technique , 2010 .

[5]  Michael E. Walker,et al.  Economic impact of condenser fouling in existing thermoelectric power plants , 2012 .

[6]  Juha Kaikko,et al.  Comparison of power plant steam condenser heat transfer models for on-line condition monitoring , 2014 .

[7]  E. Nebot,et al.  Assessment of the antifouling effect of five different treatment strategies on a seawater cooling system , 2015 .

[8]  D. Sales,et al.  Model for fouling deposition on power plant steam condensers cooled with seawater: Effect of water velocity and tube material , 2007 .

[9]  Krzysztof Urbaniec,et al.  Optimal cleaning schedule for heat exchangers in a heat exchanger network , 2005 .

[10]  The influence of condenser cooling seawater fouling on the thermal performance of a nuclear power plant , 2015 .

[11]  J. Szybist,et al.  Effect of heat exchanger material and fouling on thermoelectric exhaust heat recovery , 2011 .

[12]  Lei Wang,et al.  Study on the Time Decreasing Trend Model of Condenser Cleanness Coefficient , 2012 .

[13]  H. Tuo,et al.  Effect of venting the periodic reverse vapor flow on the performance of a microchannel evaporator in air-conditioning systems , 2014 .

[14]  Syed M. Zubair,et al.  The impact of fouling on performance evaluation of evaporative coolers and condensers , 2005 .

[15]  Krzysztof Urbaniec,et al.  Identification of the influence of fouling on the heat recovery in a network of shell and tube heat exchangers , 2013 .

[16]  I. Suárez,et al.  Application of a design code for estimating fouling on-line in a power plant condenser cooled by seawater , 2001 .

[17]  Petro O. Kapustenko,et al.  Accounting for Thermal Resistance of Cooling Water Fouling in Plate Heat Exchangers , 2012 .