In this paper, a mathematical model is developed to describe the dynamics of the drum-level of a natural circulation boiler. A boiler-drum is divided into two parts; the upper part contains saturated steam while the lower part contains a steam/water mixture. The ratio of the steam in that mixture is defined in this work as the steam volumetric ratio. On the other hand, balance equations are app...

As the important signal of once-through boiler's water-fuel ratio control, intermediate point temperature of supercritical boiler plays a key role in the decision of steam and water’s boundary, the match of fuel and water, the control of main steam temperature. The condition of its control directly impacts the once-through boiler’s safety and economy running. For an uncertainty model, a good co...

Many heat transfer applications, such as steam generators in a boiler or air cooling in the coil of an air conditioner, can be modelled in a bank of tubes containing a flowing fluid at one temperature that is immersed in a second fluid in a cross flow at different temperature. CFD simulations are a useful tool for understanding flow and heat transfer principles as well as for modelling these ty...

We previously reported on the sporadic contamination by Legionella anisa of shower units and sink taps at Ryukyu University Hospital. Starting in July 2003, the neonatal area underwent an 8-month reconstruction, and in March 2005, the boiler system was replaced. We therefore examined shower water and tap water for the presence of Legionella just after replacement of the boiler system. In 3 of t...

A commercially available computational fluid dynamics code has been used to simulate temperature and flow profiles in the upper, convective heat transfer region of a recovery boiler for different bullnose designs. The convective heat transfer region of the furnace was simulated by examining a zone that begins below the bullnose and ends at the economizer. Superheater tubes and a boiler bank wer...

Results from mathematical modeling of aerosol formation during combustion of woody biomass fuels were compared with results from particle size distribution (PSD) measurements at a pilotscale biomass combustion unit with moving grate and flame tube boiler. The mathematical model is a plug flow model considering coagulation, nucleation, condensation, and particle deposition mechanisms (thermophor...

<span>The purpose of this article is to describe the automation developed by means a programmable logic controller for burner fire tube boiler, in order improve efficiency process generating steam quantified through percentage oxygen generated. The implementation was under control strategy based on use servomotors that allow gradually open or close solenoid valves dose amount air and fuel...

Two interconnected mathematical models have been developed to describe slagging of a steam boiler furnace at the macro and micro levels. The macro-level model is implemented in Ansys Fluent. Using fuel characteristics temperature furnace, this can predict ash formation on heat exchanger tubes when melting mineral part solid fossil exceeded. obtained values rates are used as initial data softwar...