1 Firing systemsThis part of this European Standard specifies the requirements for internal or external grate firing systems commencing atThe fuel bunkers and ending atThe ash extraction plant. For combination of various firing systems,The individual requirements of each system also apply.If several fuels are burnt simultaneously or if a fuel quality varies considerably (e.g. moisture content), additional safety measures can be necessary, especially with respect to limitation of the fuel flow intoThe firing system and ensuring proper air supply toThe individual fuels.2 FuelsThe solid fuels covered are:— all coal qualities, e.g. lignite or brown coal, sub-bituminous or hard brown coal, bituminous coal or hard coal, pitch coal, anthracite, coke, coal culm, coal sludge;— other fossil solid fuels (e.g. petrol coke peat, oil shale);— biomass solid fuels (e.g. wood, wood wastes [bark], energy plants [miscanthus], harvest wastes [straw]);— municipal waste solid fuels (e.g. garbage, sewage sludge, refuse derived fuels [RDF]);— industrial waste solid fuels (e.g. petrol coke, soot, tyres, paper wastes, coated wood chips, spent wood, animal product wastes).Fuel blends from two or more of these groups (see 4.1.7), or fuels of unconventional or unknown quality can require special safety measures which can be proved either by practical experience gained from comparable fuels, or by suitable tests, e.g. in accordance with EN 26184-1. Such measures should be documented byThe manufacturer.Fuels on whichThe design is based should be specified inThe operating instructions (see 11.2).This should includeThe fuel data for 100 % input of the basic fuel andThe data for any supplementary fuels together withTheir maximumThermal input percentage.3 Operational equipmentThe requirements for operational equipment in clauses 4 to 10 apply to steam boilers and hot water generators with permanent supervision by properly trained personnel familiar withThe special conditions of the firing systems andThe type of fuel.Annex A containsThe operational requirements for permanent supervision
EN 12953-12:2003 history
2003EN 12953-12:2003 Shell boilers - Part 12: Requirements for grate firing systems for solid fuels for the boiler