ASME 47:2006 pdf download Definitions and Descriptions of Terms
gas generator: assemblage of equipment consisting of acompressor(s),combustor(s), and a turbine(s) that produces hot gases at elevated pressure. It may be either asingle- or multi-spool (rotor) assemblage.gas generator furbine: turbine portion of a gas generatorgas furbine engine: machine that converts thermal energyinto mechanical work. It consists of a compressor(s)a combustor or other thermal device(s) that heats theworking fluid, a turbine(s), a control system, and auxiliary equipment.
gas turbine power planf: gas turbine engine and all essential equipment necessary for the production of powerin useful form.
gasification: partial oxidation of a hydrocarbon feed intoa combustible fuel gas (syngas), usually composed primarily of hydrogen, carbon monoxide, and methane.gasifier: vessel in which the gasification reactions takeplace.
gross heaf of combustion at constanf polume: heat producedby the combustion of unit quantity of solid or liquidfuel when burned at constant volume in an oxygen bombcalorimeter under specified conditions,with theresulting water condensed to a liquid. Expressed inMJ/kg(Btu/1bm)
heat input: mass flow rate of fuel(s) multiplied by thehigh or low heat value of the fuel(s).
heat ofcombustion: heat released from the complete oxidation from a fuel with the reactant products at a referencecondition
heat rate (ntechanical or electrical): heat input per unit otpower output.
(a) For gas turbine heat rate, the turbine is chargecwith the aggregate heat content (heat of combustion plu!enthalpy) of the fuel gas supplied plus any chargeableaggregate enthalpy added by other feed stream and feedstream heatersIt is credited with the aggregate enthalpyof any compressed air streams leaving the turbine envelope.Turbine-generator performance is normallydefined on the basis of the gross power output at thegenerator terminals less the power used by the mini-mum electrically driven turbine auxiliaries and excitation equipment, supplied as part of the turbinegenerator unit, required for reliable and continuousoperation.
(b) For steam turbine heat rate, the turbine is chargedwith the aggregate enthalpy of the steam supplied plusany chargeable aggregate enthalpy added by the reheaters. It is credited with the aggregate enthalpy of thefeedwater returned from the cycle to the steam generator. Turbine-generator performance is normally defined on the basis of the gross power output at the generatorterminals less the power used by the minimum electri-cally driven turbine auxiliaries and excitation equipment, supplied as part of the turbine-generator unitrequired for reliable and continuous operation.heat recouery gasification process: process employing a heatexchanger(s) to transfer the heat (radiant and /or convec-tive) contained in the synthesis gas exiting the gasifica-tion vessel to a medium such as steam. Examples ofthis equipment include radiant syngas coolers, firetubeboilers, and waterwall type boilers.
heat recovery steam generator (HRSG): heat exchanger(s)to transfer the heat (radiant and/or convective) con-tained in the exhaust gas from a gas turbine to steam.heating ualue: energy released when a fuel and oxidant,normally at 25°C (77°F), are burned to completion andthe products of combustion are cooled to a specifiedtemperature, normally 25°C (77F)Although the unitsof heating value may be energy per unit mole(M]/kg-mol,Btu/lb-mol) or energy per unit volume(M]/N-m% Btu/scf), the units of heating value used inthis Code are energy per unit mass (MJ/kg or Btu/lbm).Heating value may be reported as either lower (net)heating value or higher (gross) heating value, as longas all fuels, product gases, and syngases are reportedusing consistent terms. Lower heating value (LHV) iscalculated as if all HO in the combustion productsremains in the vapor state. Higher heating value (HHV)is calculated as if all HO in the combustion productswere condensed, and includes the heat released by thatcondensation of all HO in the combustion products,including any moisture initially present in the fuel andoxidant. Moisture in the fuel-oxidant mixture evapo-rates during combustion, consuming the same amountof energy as it releases during post-combustion conden-sation, so the net calculated condensation energy represents only the HO formed from the combustion ofhydrogen.