In order to meet the flexibility operation needs of coal-fired units under goal carbon peak and neutralization, it is imperative for circulating fluidized bed (CFB) participate in deep regulation. By systematically summarizing regulation practice existing SC subcritical-parameter-levels CFB units, feasibility technology an ultra-supercritical (USC) unit development being built analyzed demonstr...

In order to alleviate problems such as large fluctuations in grid load caused by the high proportion of renewable energy, circulating fluidized bed (CFB) power plants undertake task rated regulation. This study discussed combustion characteristics a 100 KW CFB boiler during operation process varying loads and analyzes characteristics, regulation rate emissions variation law high- low-rated inte...

The management of solid waste has become a major problem and budget item of municipalities, especially in rapidly developing cities. The only alternatives for post-recycling waste are sanitary landfills, which require large tracts of land, and waste-to-energy (WTE) plants which are costly to build; an additional problem in the developing world is the high (>50%) organic and moisture content of ...

Coal is a major energy source, and on the other hand coal is a source of pollution. Some of the important environmental issues related to use of coal in energy production are the release of sulphur dioxide (SO2). SO2 is a precursor to acid rain, responsible for atmospheric pollution and damage to human health. Therefore, investigations and development of technologies promising low SO2 emission ...

In this paper computational analysis of pressure and velocity in coal combustion system using the fluent software is analysed. The combustion of coal is used in circulating fluidized bed combustion system. This work is concerned about gas–solid two-phase mixtures flowing upwards through the fast beds. The type of information resulting from various ways of analyzing the pressure variations and t...

As an industrial solid waste, the discharge of a large amount red mud (RM) causes serious environmental problems; thus, proportion RM co-combustion has been proposed to solve consumption problem. In this paper, experiment with various proportions was conducted on 0.2 t/h circulating fluidized bed (CFB) boiler. Desulfurization performance, combustion characteristics, and ash deposition character...

The design of energy efficient engineering systems is crucial for sustainable operation when economic and environmental consequences are considered. Circulating Fluidized Bed (CFB) boilers, which among the major contributors to world electricity production, still increasing in numbers unit sizes. Primary air nozzles key components CFB boilers that may decrease consumption increase efficiency, t...

As most classical fluidization technologies, Circulating Fluidized Beds (CFB) are widely employed in chemical and physical operations. However, CFB Reactors still have some disadvantages such as the non-uniform solid particles distribution backflow of near wall, which deteriorate system mixing, lead to low conversion/heat mass transfer rate. To improve performance, we propose current work study...

This work aims at gaining novel knowledge of the mechanisms governing solids flow pattern in furnace large-scale Circulating Fluidised Bed (CFB) boilers. A fluid-dynamically down-scaled unit resembling an existing 200-MWth CFB boiler was built and validated against full-scale data. The extensive experimental campaign showed, among others, that presence or absence a dense bed governs entrainment...