# The Environmental Authorisations (Scotland) Regulations 2018, Paragraph 2: Interpretation: general


In this schedule—
“CCGT” means combined cycle gas turbines,
“determinative fuel” means the fuel which, amongst all fuels used in a multi-fuel firing combustion plant using the distillation and conversion residues from the refining of crude oil for own consumption alone or with other fuels, has the highest emission limit value as set out in Part 3 of this schedule, or, in the case of several fuels having the same emission limit value, the fuel having the highest thermal input amongst those fuels,
“diesel engine” means an internal combustion engine which operates according to the diesel cycle and uses compression ignition to burn fuel,
“gas engine” means an internal combustion engine which operates according to the Otto cycle and uses spark ignition or, in the case of dual fuel engines, compression ignition to burn fuel,
“gas turbine” means any rotating machine which converts thermal energy into mechanical work, consisting mainly of a compressor, a thermal device in which fuel is oxidised in order to heat the working fluid, and a turbine,
“indigenous solid fuel” means a naturally occurring solid fuel fired in a combustion plant specifically designed for that fuel and extracted locally,
“multi-fuel firing combustion plant” means any combustion plant which may be fired simultaneously or alternately by two or more types of fuel,
“operating hours” means the time, expressed in hours, during which a combustion plant, in whole or in part, is operating and discharging emissions into the air, excluding start-up and shut-down periods,
“rate of desulphurisation” means the ratio over a given period of time of the quantity of sulphur which is not emitted into air by a combustion plant to the quantity of sulphur contained in the solid fuel which is introduced into the combustion plant facilities and which is used in the plant over the same period of time,
“stack” means a structure containing one or more flues providing a passage for waste gases in order to discharge them into the air.

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Source: https://www.legislation.gov.uk/ssi/2018/219/schedule/21/paragraph/2 (the official version)
Page: https://openlegislation.uk/environmental-authorisations-scotland-regulations-2018/schedule-21/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.