in this paper, first a sensitivity analysis of parameters affecting the performance of the steam generator is performed. this process includes the pinch temperature difference and the gas velocity (width of the hrsg) as the operating parameter and geometrical parameters (fin’s thickness, fin’s height, number of fins in each inch, tube transverse pitch) for each pressure parts is carried out, an...

Continued operation of high temperature tubing in superheaters and reheaters presents operation and maintenance personnel with risk-based decisions. The design of SH/RH tubing and associated dissimilar metal welds is well understood, as are the life degradation mechanisms, which have been thoroughly documented by EPRI. The major problems associated with life prediction of SH/RH tubing are the n...

The paper presents the method of on-line diagnostics of the bed temperature controller for the fluidized bed boiler. Proposed solution is based on the methods of statistical process control. Detected decrease of the bed temperature control quality is used to activate the controller self-tuning procedure. The algorithm that provides optimal tuning of the bed temperature controller is also propos...

A process integration model is developed based on mixed integer linear programming. The analysis is carried out using the reMIND software in combination with the commercial optimization software CPLEX. The steam production (heat recovery boiler, bark boiler and steam turbines) and the process steam consumers (digester, evaporation plant, bleaching plant as well as pulp dry machine and paper mak...

To determine dominant factors on arsenic leaching from the coal fly ash, arsenic leaching test under a constant pH was performed. Twelve fly ash samples were collected from two coal fired power plants (600 MWe) having different boiler types. Arsenic in the raw coal was almost all associated with the fly ash in both power plants; however arsenic leaching fraction was strongly differed in boiler ...

This paper presents an approach that uses supervisor architecture structure with the intention to reach flexibility of the combustion process control during the boiler functioning on the example of the high qualified Power AG. For this case, adaptive distributed control system with the supervisor on top is invented, on the middle layer with load distribution on burners and maintenance of optima...