reasons of high gcv in fly ash in cfbc boiler

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Factors that affect CFBC boiler furnace tube erosion by

Aug 04, 2017· Fly ash particle sieve analysis proves the efficiency of cyclone. The gain in efficiency is a matter of how much is the ash content and what is the GCV of fuel. CFBC boiler needs high …

Utilization of fly ash coming from a CFBC boiler co-firi

Cited by: 26 CFBC ash is different from most typical coal combustion by-products for (1) high content of f-CaO and SO 3 (usually anhydrite) in AFBC ash, and high content of SO 3 (usually anhydrite) in PFBC ash; (2) few spherical particles can be seen in CFBC fly ash for the temperature in the CFBC boiler (often 800–900 °C) is lower than that in the pulverized coal-fired boiler (often 1300–1500 °C); (3) self …

GCV of fly ash Gross calorific value of fly ash GCV

GCV of fly ash = Gross calorific value of fly ash GCV of fuel = Gross calorific value of fuel 8. Heat loss due to unburnt in bottom ash (%) n o Total ash collected fuel burnt GCV of bottom ash GCV of Fuel L5 1 0,033 0,85 800 4100 0,55 Total ash = Total ash collected in kg Fuel burnt = Fuel burnt in kg GCV of bottom = Gross calorific value of bottom ash GCV of fuel = Gross calorific value of fuel

LOI (Loss on Ignition) – The Truth | chargewa

Jun 21, 2012· The main reason was identified that the boiler was designed for higher ash coal & operating coal was having lesser ash hence lesser density causing higher air velocity. VM presence indicated loss of Coal as fired itself to Ash, but reported as LOI.

Energy Performance Assessment of CFBC Boil

elements that comprise the coal substance together with ash and moisture. B ) CFBC boiler P.K. Nag [5] through which we understand the functioning of the CFBC boiler. It gives an overview of the functioning of the boiler. According to this, the CFBC boler is divided into two sections.

International Journal of Innovative Research in Scien

D. Ash analysis GCV of bottom ash 700 kcal/kg 700 kcal/kg GCV of fly ash 150 kcal/kg 150 kcal/kg Bottom ash to fly ash ratio 45:55 45:55 I. RESULT FROM CALCULATION Result derived from the above formulas for the fuel Indian lignite coal with GCV of 4300 kcal/kg and semi bituminous coal with GCV of 5800 kcal/kg is shown in table 1 and 2.

(PDF) Utilization of fly ash coming from a CFBC boiler

Fly ash coming from a circulating fluidized bed combustion (CFBC) boiler co-firing coal and petroleum coke (CFBC fly ash) is very different from coal ash from traditional pulverized fuel firing


the CFBC fly ash. Keywords: CFB boiler, fly ash, unburned carbon, coal the main difficulty was quite high content of unburned carbon in the fly ash. The issue, however, was . Unburned carbon in the circulating fluidised bed boiler fly ash 257 not just a distinctive feature of that particular combustor since similar problems were also

Characteristics of CFBC fly ash and properties of ceme

Coal-fired fly ash was used for partial cement replacement by weight. The specific gravity of coal-fired fly ash is 2.39. The blaine specific surface area was 4050 cm 2 /g. Coal-fired fly ash contains significantly higher amounts of silicon dioxide (SiO 2), aluminum oxide (Al 2 O 3), and ferric oxide (Fe 2 O 3).The chemical compositions of OPC, CFBC fly ash and coal-fired fly ash are given in

Coal Ash, Fly Ash, Bottom Ash, and Boiler Slag | NR

Fly ash (n.): a light form of coal ash that floats into the exhaust stacks. Bottom ash (n.): the heavier portion of coal ash that settles on the ground in the boiler. Boiler slag (n.): melted coal ash

Predicting Fly Ash and Bottom Ash Combustibles

Carbon loss in boiler reduces the boiler efficiency, and if the coal is high ash as well as low reactive this can be a substantial portion. The existence of unburned carbon in ash decreases not only the combustion efficiency but also the grade of fly ash for commercial sale. Predicting percentage combustibles in fly ash in a tangential fired boiler using proximate analysis of coal gives boiler

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