Research And Application Of Sootblowing Optimization Test For High Temperature Heating Surface For 1000MW Ultra Supercritical Tower Type Boiler

Boiler fouling process influenced by the larger sizes and higher parameters is becoming more complicated in accompany with the increase of boiler capacity and diversity of configuration. Boiler fouling together with the blindness in current timely soot-blowing strategy makes it necessary to study fouling monitoring and soot-blowing optimization for boilers of ultra-supercritical tower type units.In this paper, the boiler fouling monitoring system for half radiation and half convection heating surface for boilers of ultra-supercritical tower type units were developed on the bases of thermal balance and exchange principle. The fouling monitoring system is established for the high temperature which is on its modes of the half radiation and half convection thermal energy transport. The law for the increase of fouling is found by thermal dynamic calculation based on the inlet and outlet flue gas temperature measurement of heating surface and the real-time data acquisition system. And the impact factors for the heating surface fouling coefficient were also discussed. Subsequently, the fouling monitoring model is proved to be valid and practical throughout the analysis of a series of soot-blowing experiments on a domestic 1000 MW ultra supercritical tower type boiler. Finally, the reasonable soot-blowing project is presented on the bases of fouling monitoring model which guides the operation of the boiler soot-blowing optimizing system.