Since the feed-stock (coal and limestone) used for a fluidized bed (FB) boiler is coarser «6,000 I'lm) than pulverized coal «200 I'lm), a crusher-based coal preparation system is sufficient for the former.

 — Abstract The re-engineered feedstock technique converts low-quality coal into high-quality coal using physical processing on AFBC boiler under full scale with coal as primary fuel. The physical feedstock mixing was adapted as it is identified as having the potential to improve the quality, environmental impact, and energy efficiency of coal …

Abstract—The re-engineered feedstock technique converts low-quality coal into high-quality coal using physical processing on AFBC boiler under full scale with coal as primary fuel. The physical feedstock mixing

 — Experiments conducted in a 300 MWe coal-fired utility boiler confirm that the use of the control strategy of the air flow rate for the combustion optimization improves the stability of the main steam pressure and mitigates the fluctuations of the coal flow.

 — A method for choosing the optimum fineness of coal in pulverised-fuel boilers is presented. This method is based on economic criteria and takes into account variations of the power unit load as well as the durability and the output of pulverisers.

♦ Fineness: Up to 7% improvement passing 75µ (using PfMaster velocity info) Improved fineness of coal allows for complete combustion of the coal particles given sufficient oxygen. Completing combustion of all coal gives a higher combustion efficiency. Incomplete combustion results in a residual carbon-in-ash or commonly

 — They have a particular interest in technologies that can reduce NOx, SOx, and mercury emissions from coal-fired boilers, and have been investigating the injection of sorbents such as limestone and trona into a boiler to reduce SOx and Hg emissions.

Depending on the design, industrial boilers can burn natural gas, oil, coal and other solid fuels such as biomass. Natural gas requires minimal fuel preparation, mixes well with the combustion air supply and burns with a low flame. Oil, depending on its grade, will need heating and screening prior

The coal is powder in to fine granulated form and is mixed with a high pressure air and discharged through the burner in high temperature flames. The powder coal utilized is a low ash and high volatile coal which highly efficient fuel for boiler.

Higher than desired flyash or bottom ash Loss on Ignition (LOI) or unburned Carbon content is frequently caused by less than optimum coal fineness. The graph below illustrates a typical relationship between flyash LOI and coal fineness on a tangentially fired boiler firing Eastern Bituminous coal.