EN 12953-12:2003

Foreword
1 Scope
   1.1 Firing systems
   1.2 Fuels
   1.3 Operational equipment
2 Normative references
3 Terms and definitions
4 Fuel bunkers with conveying plant
   4.1 General
   4.2 Conveying plant
   4.3 Fuel bunkers
   4.4 Fuel bins
5 Fuel treatment
   5.1 General
   5.2 Size reduction of the fuel
   5.3 Drying of the fuel
6 Fuel feeding
7 Explosion prevention measures
8 Equipment for combustion air supply and flue gas discharge
   8.1 Air supply
   8.2 Combustion air/fuel ratio
   8.3 Flue gas discharge
9 Firing system
   9.1 General
   9.2 Control and monitoring
   9.3 Electrical equipment
   9.4 Safety precautions
        9.4.1 General
        9.4.2 Purging of the flue gas passes
        9.4.3 Lightning-up
        9.4.4 Start-up
        9.4.5 Shutting down
   9.5 Common stack for several firing systems
10 Ash handling and extraction
11 Operation and maintenance
   11.1 General
   11.2 Operating instructions
Annex A (informative) Operational requirements for permanently
         supervised firing systems for solid fuels on grate
         firing systems
Annex ZA (informative) Relationship between this European
         Standard and Essential Requirements of EU Directive
         97/23/EC
Bibliography

This part of this European Standard specifies the requirements for internal or external grate firing systems commencing at the fuel bunkers and ending at the 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 into the firing system and ensuring proper air supply to the individual fuels.