توضیحات :
NFPA 8503 – Standard for Pulverized Fuel Systems
۱۹۹۷ Edition
Chapter 1 Introduction
۱-۱ Scope.
۱-۱-۱ This standard shall apply to pulverized fuel systems, beginning with the raw fuel bunker, which is ahead of the pulverizer, and the point at which primary air enters the pulverizing system, and terminating at the point where pressure can be relieved by fuel being burned or collected in a device that is built in accordance with this standard. The pulverized fuel system shall be defined to include the primary air ducts, which are upstream of the pulverizer, to a point where pressure can be relieved by application of a suitable vent or other means.
۱-۱-۲ This standard shall cover only those fuels having reactivities greater than that of Pennsylvania anthracite with a volatile content of 8 percent on a dry basis. Reactivity of a fuel, relative to this base, shall be determined by the pulverizer manufacturer utilizing his or her own technique, and applicability of the standard shall be determined and agreed to by the user.
۱-۱-۳ In the case of pulverized fuel–fired boiler furnaces, a related work is NFPA 8502, Standard for the Prevention of Furnace Explosions/Implosions in Multiple Burner Boilers. Users of this type of equipment are, therefore, referred to both standards.
۱-۱-۴ This standard shall exclude those systems with an oxygen content that is greater than 21 percent, which require special attention.
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