Fly ash from coal combustion in the CFB boiler
The article shows the comparative results of two fly ash from coal combustion in the CFB (circulating fluidized bed) boiler. Over the years the market for combustion by-products (CBP) has been constantly changing. It touches both the widening of the range of the fuels used and the direction and amount of the ash used in the cement and building industries, as well as in the road industry. Coal mines, one of the major mass recipients of fly ash have expe-rienced the temporary difficulties with access to the chosen types of ash, especially the most wanted ones showing the best binding properties, and at the same time the over-supply of CBP in power plants located within further from coal mines.
Another important aspect of the changes is the con-stant widening of the fuel range used in power plants (bio-mass, waste fuels, sewage sludge) . The addition of biomass is justified by both the reduction of gas pollution and the necessity of the share in ‘green energy,’ as well as the possibility of obtaining the additional funds, but also in some cases the quality of the fuel. The type of co-combusted biomass is mainly deter-mined by the existence of the agriculture and wood industry in the area, the farms of energy plants, and the cost of transportation. Among the frequently co-combusted bio-mass are: wood, wood chips, bark, straw, olive mill cake, and sunflower husks . The properties of fly ash from co-combustion depend greatly on the burning conditions (the kind of boiler, tem-perature of burning), the amount and chemical composition of the ash from coal and biomass, as well as the share of the biomass in the mixture with coal.
Lignite fuel in CFB boiler analysis
In the first case the lignite was the only fuel, in the second one 8% of the fuel mass was made by wood bio-mass pellet. The aim of the research was to determine the differences of properties among different ash and the suspensions made of them in order to use them in mining technologies, mainly for filling underground voids and sealing and caulk-ing of gob (breaking down zone) resulting from coal exploitation.
Biomass fuel in CFB boiler analysis
Biomass is a kind of fuel that is more and more often used in the energy industry. It supplements coal and allows it to meet the requirements of producing “green” energy and limit CO2 or sulphur emissions. Research refers to the ash originated from the combustion of the lignite with and without the wood biomass in the CFB boiler. This article shows the results of research into physical-chemical properties of fly ash obtained from the combustion of the lignite with and without the wood biomass (wood pellet). The possibilities of the use of this ash include in suspension technologies widely used in coal mines.
The general conclusion from the conducted research for the recipients using both these kind of wastes and other ones coming from the coal combustion is that even the smallest addition of the fuel of different type (e.g. biomass) can change the properties of the used suspensions.
Circulating fluidised bed Boiler Cases
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