Top: Science: Energy: Bioenergy: Terminology: P




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Particulate

A small, discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions. Particulates take the form of aerosol, dust, fume, mist, smoke, or spray. Each of these forms has different properties.


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Photosynthesis

Process by which chlorophyll-containing cells in green plants concert incident light to chemical energy, capturing carbon dioxide in the form of carbohydrates.


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Pilot scale

The size of a system between the small laboratory model size (bench scale) and a full-size system.


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Present value

The worth of future receipts or costs expressed in current value. To obtain present value, an interest rate is used to discount future receipts or costs.


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Process heat

Heat used in an industrial process rather than for space heating or other housekeeping purposes.


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Producer gas

Fuel gas high in carbon monoxide (CO) and hydrogen (H2), produced by burning a solid fuel with insufficient air or by passing a mixture of air and steam through a burning bed of solid fuel.


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Public utility commissions

State agencies that regulate investor-owned utilities operating in the state.


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Public Utility Regulatory Policies Act

(PURPA) A federal law requiring a utility to buy the power produced by a qualifying facility at a price equal to that which the utility would otherwise pay if it were to build its own power plant or buy power from another source.


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Pyrolysis

The thermal decomposition of biomass at high temperatures (greater than 400° F, or 200° C) in the absence of air. The end product of pyrolysis is a mixture of solids (char), liquids (oxygenated oils), and gases (methane, carbon monoxide, and carbon dioxide) with proportions determined by operating temperature, pressure, oxygen content, and other conditions.



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