How to use data about coal combustion in BFB for design of CFB boilers ?
There are several methodologies for fuel testing in bubbling fluidized bed conditions now in use in the world. Those methodologies are supported by already standard set of experimental facilities, laboratory and pilot furnaces. Data obtained using mentioned methodologies are proven in practice in a number of cases by choosing concepts of the BFBC boilers, and making calculation of the main regime parameters and dimensions and determining type and capacity of
the auxiliary boiler systems.
Fast development of the circulating fluidized bed boilers, posed the question of obtaining data necessary for choosing CFBC boilers concept and design and calculation of the main regime parameters and boiler dimensions. According to my knowledge, there is no in open literature published methodology for investigation of the coal suitability for CFB combustion, and for obtaining data for CFBC boiler design and calculation of the optimal design parameters and dimensions.
In the paper differences between aerothermodynamic conditions in BFBC and CFBC boilers are discussed. Based on the ITE methodology for investigation of coal suitability for BFBC combustion every specific data obtained is discussed in the light of the differences between combustion conditions in BFBC and CFBC boilers.
Questions and dilemmas ought to be solved for CFBC boiler design
Engineer designer is faced with the number of questions and dilemmas in the course of CFBC boiler design and calculation of main parameters and dimensions. Some of them are listed below. There are a lot of questions that are common for BFBC and CFBC boiler design, so the common questions will be listed first. Organization of combustion process in CFBC boilers is different compared to the combustion in BFBC boilers. As a consequence there are some questions and dilemmas that are different for CFBC boilers. Questions listed at the end are specific for CFBC boilers.
The answer for the question posed in the title of this paper is: Yes, we can use data obtained by fuel testing in BFBC conditions for conceptual design and calculation of regime parameters and dimensions of the CFBC bolier, but we have to bear in mind differences between conditions in BFBC and CFBC to make necessary corrections and recalculations.Most probably we will be on the safe side.
Circulating fluidised bed Boiler Cases
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