NFPA 85 Boiler and Combustion Systems Hazards Code
NFPA 85 锅炉和易燃系统危险性规范
1.1* Scope. This code shall apply to single burner boilers, multiple burner boilers, stokers, and atmospheric fluidized-bed boilers with a fuel input rating of 3.7 MWt (12.5 million Btu/hr) or greater, to pulverized fuel systems, to fired or unfired steam generators used to recover heat from combustion turbines [heat recovery steam generators (HRSGs)], and to other combustion turbine exhaust systems.
1.1.1 This code shall cover design, installation, operation, maintenance, and training.
1.1.2 This code shall cover strength of the structure, operation and maintenance procedures, combustion and draft control equipment, safety interlocks, alarms, trips, and other related controls that are essential to safe equipment operation.
1.1.3 Coordination of the design and operating procedures of the boiler furnace or HRSG system and any flue gas cleanup systems downstream of the postcombustion gas passes shall be required. Such coordination shall include requirements for ensuring a continuous flow path from the combustion air inlet through the stack.
Improve fire safety and system reliability with the 2011 NFPA 85 Boiler and Combustion Systems Hazards Code.
Updated for 2011, this comprehensive document applies to the full range of large boiler installations and pulverized fuel systems
· Large boilers, including atmospheric fluidized bed boilers with a minimum fuel input rating of 12.5 million Btu/hr (3.6 MW)
· Stoker operations
· Pulverized fuel systems
· Fired or unfired steam generators used to recover heat from combustion turbines
Major changes for 2011 include
· New definition and rules for a Combustion Turbine Purge Credit enabling designers and operators to establish and maintain a "purged" condition for heat recovery steam generators between restarts
· Streamlined requirements for continuous trend display for single burner boilers
· Revised boiler requirements for purging the boiler enclosure where no fans remain in service
· Expanded guidance on burner management system design describes the types of signals and transmitters used to initiate safety alarms and interlocks and appropriate monitoring methods
· Added guidance regarding flue gas analyzers installed in the flue gas stream
Complete with a timesaving chapter on common requirements for all boilers, the 2011 NFPA 85 contains important provisions for boiler or combustion system designers, operators, and enforcers working with these systems. (Softbound, 235 pp., 2011)