6MW Biomass Power Plant How Much Will it Cost ?
The total installed costs of 6MW biomass power generation technologies varies significantly by technology and country. The total installed costs of stoker biomass boilers was between USD 1 880 and USD 4 260/kW in 2010, while those of circulating fluidised bed boilers were between USD 2 170 and USD 4 500/kW. The cost of CHP plants is significantly higher than for the electricity-only configuration.
Many biomass power plant options are mature, commercially available technologies (e.g. direct combustion in stoker boilers, low-percentage co-firing, anaerobic digestion, municipal solid waste incineration, landfill gas and combined heat and power). While others are less mature and only at the beginning of their deployment (e.g. atmospheric biomass gasification and pyrolysis), still others are only at the demonstration or R&D phases (e.g. integrated gasification combined cycle, bio-refineries, bio-hydrogen). The potential for cost reductions is therefore very heterogeneous. Only marginal cost reductions are anticipated in the short-term, but the long-term potential for cost reductions from the technologies that are not yet widely deployed is good.
There are two main components of a combustion–based 6MW biomass plant: 1) the biomass-fired boiler that produces steam; and 2) the steam turbine, which is then used to generate electricity.
The two most common forms of boilers are stoker and fluidised bed. These can be fuelled entirely by biomass or can be co-fired with a combination of biomass and coal or other solid fuels .
Stoker boilers burn fuel on a grate, producing hot flue gases that are then used to produce steam. The ash from the combusted fuel is removed continuously by the fixed or moving grate. There are two general types of stokers. Underfeed boilers supply both the fuel and the air from under the grate. Overfeed boilers supply the fuel from above the grate and the air from below.
Fluidised bed boilers suspend fuels on upward blowing jets of air during the combustion process. They are categorised as either atmospheric or pressurised units. Atmospheric fluidised bed boilers are further divided into bubbling-bed and circulating-bed units; the fundamental difference between bubbling-bed and circulating-bed boilers is the fluidisation velocity (higher for circulating). Circulating fluidised bed boilers (CFB) separate and capture fuel solids entrained in the highvelocity exhaust gas and return them to the bed for complete combustion. Pressurised CFB are available, although atmospheric-bubbling fluidised bed boilers are more commonly used when the fuel is biomass. They can also be a more effective way to generate electricity from biomass with a higher moisture content than typical in a stoker boiler .
Circulating fluidised bed Boiler Cases
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