Burning coal in power plants produces significant amounts of deposits like fouling and slagging on boiler surfaces which contributes to the overall poor performance of the power plants (by reducing electricity generation capacity, decreasing boiler efficiency and increasing overall maintenance cost). Recent research and development on boiler fouling and slagging problems, with the current preve...

A simple simulation using SIMULINK is presented to model the thermal/control behaviour of a domestic gas boiler. The simulation was the first step in a research programme to investigate the efficacy of control using an oxygen sensor. A brief review of boiler control is used to outline current practice and research developments. Ratio control in several forms has been investigated. Performance i...

Relational transducers mapping sequences of input relations to sequences of output relations are proposed for high-level declarative specifications of business models. See [404] for a related class of ASM-transducers. Contains the problem description for the steam boiler control competition [7] and 22 proposed solutions obtained using the major known formal methods, with text and complete docum...

This paper presents an overview & current sources and forms of raw .materials for wood energy use and the types of machines available to convert them to the desired form for boiler fuel. Both the fuel source or raw material, and the combustion furnace will dictate the requirements for the processing system. Because of the wide range of processing equipment available, systems can be designed to ...

The varicella-zoster virus (VZV) causes two diseases: varicella (‘chickenpox’) and herpes zoster (‘shingles’). VZV vaccination of children reduces exposure to chickenpox in the population and it has been hypothesized that this could increase the prevalence of shingles. This ‘exogenous boosting’ effect of VZV raises an important equity concern: introducing a vaccination program could advance the...

The typical U.S. refuse-to-energy facility utilizes a 600 psig, 750°F steam cycle. The ability to operate at higher steam pressure and temperature cycles, without incurring excessive corrosion, results in more kilowatts per ton of refuse and, hence, more economically at­ tractive projects. This paper represents the evolution of a 900 psig, 830°F refuse boiler from lower temper­ ature and pressu...

This paper focuses on the simulation and visualisation of coal combustion in the pulverised coal boilers. It is important to find optimal boiler configurations (both for the ecological and economical reasons), determine appropriate combustibles, optimize process of combustion, etc. These tasks are typically solved using traditional Computational Fluid Dynamics (CFD) methods that are in general ...

Centrifugal heat pump has to be coupled with gas boiler to supply high temperature water in radiator heating system. Regarding to hybrid heating system (HHS), operation strategy has significant impact on its annual energy consumption and cost. In this paper, the optimal operation strategy of the HHS composed of sewage-source centrifugal heat pumps and gas boilers was analyzed. Firstly, the perf...

Under the influence of temperature and stresses, the heat resistant materials react by creeping. Boiler components subjected to creep have a limited lifetime. Creep and material structure evolution are tightly related and according to this rule a number of studies have been performed in order to relate micro structural investigation and service exposure or residual life. The determination of th...